Pandas - Plot multiple time series DataFrame into a single plot. How do you get out of a corner when plotting yourself into a corner, Full text of the 'Sri Mahalakshmi Dhyanam & Stotram'. It was introduced by John Hunter in the year 2002. We call the matplotlib.pyplot.plot () function 4 times to plot the 4 different lines. Mutually Exclusive Events. How to notate a grace note at the start of a bar with lilypond? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. We created line plots using pyplot for each of them in the animation function. For both of these cases, we're just drawing random colors from the "gist_ncar" coloramp. Now, plot multiple lines representing the relationship of the 1st column with the other columns of the array. In this example he sets a random series of number, but for my example i would set the numeric values indicating the color change, This fails with 'Invalid RGBA argument' in Matlplotlib 3.0.0. Minimising the environmental effects of my dyson brain. You can use this code to get your desire output. The colors green, cyan, magenta, One Axes has one scale, so we create a new one, in the same position as the first one, and set its scale to a logarithmic one, and plot the exponential sequence. Depending on your needs, there are various solutions / workarounds: Loop: for column, color in zip (df.columns, colors): ax.plot (df [column], color=color) Adapt the color cycle: One is by using subplot () function and other by superimposition of second graph on the first i.e, all graphs will appear on the same plot. Every time we pass the coordinates of different lines as arguments to the function. Relation between transaction data and transaction id. To resolve this issue you can use different scales for the different lines and you can do it by using twinx() function of the axes of the figure, which is one of the two objects returned by the matplotlib.pyplot.subplots() function. to download the full example code. How to Set Plot Background Color in Matplotlib? 'T10' categorical palette. If we plot it on a logarithmic scale, and the linear_sequence just increases by the same constant, we'll have two overlapping lines and we will only be able to see the one plotted after the first. for some basic colors. For example, the linear_sequence won't go above 20 on the Y-axis, while the exponential_sequence will go up to 20000. How to handle a hobby that makes income in US. Calculate the area of an image using Matplotlib. The current plots index is represented by the third argument. In our earlier article, we saw how we could use Matplotlib to plot a simple line to connect between points. prefix. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. \[RGB_{result} = RGB_{background} * (1 - \alpha) + RGB_{foreground} * \alpha\]. - the incident has nothing to do with me; can I use this this way? Entrepreneur, Software and Machine Learning Engineer, with a deep fascination towards the application of Computation and Deep Learning in Life Sciences (Bioinformatics, Drug Discovery, Genomics), Neuroscience (Computational Neuroscience), robotics and BCIs. xkcd color survey with 'xkcd:' How to create multiple subplots in Matplotlib in Python? Matplotlib plot multiple lines with same color. The segments array for line collection, # needs to be (numlines) x (points per line) x 2 (for x and y), # Create a continuous norm to map from data points to colors, Discrete distribution as horizontal bar chart, Mapping marker properties to multivariate data, Shade regions defined by a logical mask using fill_between, Creating a timeline with lines, dates, and text, Contouring the solution space of optimizations, Blend transparency with color in 2D images, Programmatically controlling subplot adjustment, Controlling view limits using margins and sticky_edges, Figure labels: suptitle, supxlabel, supylabel, Combining two subplots using subplots and GridSpec, Using Gridspec to make multi-column/row subplot layouts, Complex and semantic figure composition (subplot_mosaic), Plot a confidence ellipse of a two-dimensional dataset, Including upper and lower limits in error bars, Creating boxes from error bars using PatchCollection, Using histograms to plot a cumulative distribution, Some features of the histogram (hist) function, Demo of the histogram function's different, The histogram (hist) function with multiple data sets, Producing multiple histograms side by side, Labeling ticks using engineering notation, Controlling style of text and labels using a dictionary, Creating a colormap from a list of colors, Line, Poly and RegularPoly Collection with autoscaling, Plotting multiple lines with a LineCollection, Controlling the position and size of colorbars with Inset Axes, Setting a fixed aspect on ImageGrid cells, Animated image using a precomputed list of images, Changing colors of lines intersecting a box, Building histograms using Rectangles and PolyCollections, Plot contour (level) curves in 3D using the extend3d option, Generate polygons to fill under 3D line graph, 3D voxel / volumetric plot with RGB colors, 3D voxel / volumetric plot with cylindrical coordinates, SkewT-logP diagram: using transforms and custom projections, Formatting date ticks using ConciseDateFormatter, Placing date ticks using recurrence rules, Set default y-axis tick labels on the right, Setting tick labels from a list of values, Embedding Matplotlib in graphical user interfaces, Embedding in GTK3 with a navigation toolbar, Embedding in GTK4 with a navigation toolbar, Embedding in a web application server (Flask), Select indices from a collection using polygon selector. In this example, well use the axvline() method to plot multiple lines with different lengths. Only 'black', 'white' and 'cyan' are identical. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You can follow any of the two methods given below: You can plot multiple lines in 3D in python using matplotlib and by importing the mplot3d submodulefrom the modulempl_toolkits, an external toolkit for matplotlib in python used to plot the multi-vectors of geometric algebra. You may also like to read the following articles. Couldn't make the solution work because my dataset wasn't colors and the parameter 'c' happens to be plot line color. You can see that the Area line is not showing any identical trend with the data as the scale of the Area is very small comparatively from the Population Density. There are a number of different ways you could do this. Why do small African island nations perform better than African continental nations, considering democracy and human development? To make the plot more descriptive, we can add the legend to the plot to infer which line is represented by which color. Create y data points using numpy. By using our site, you You can either specify the color by their name or code or hex code enclosed in quotes. 2. Read our Privacy Policy. In thisPython tutorial, we will discuss, How toplot multiple lines using matplotlibin Python, and we shall also cover the following topics: Python provides the Matplotlib library, the most commonly used package for data visualization. E.g. How do I change the size of figures drawn with Matplotlib? Matplotlib indexes color Plot the data (multiple lines) and adding the features you want in the plot (title, color pallete, thickness, labels, annotation, etc). has introduced stylistic differences that are important from the point In this example, well use the vlines() method to plot multiple lines with different lengths. Question: how to limit the markers to a specific section of the y axis? Data Visualization with multiple dimension, and linear separability, Changes in the standard Heatmap plot - symmetric bar colors, show only diagonal values, and column names at x,y axis ticks. To avoid overlapping of bars in each group, the bars are shifted 0.25 units from the X-axis in this example. Is there a single-word adjective for "having exceptionally strong moral principles"? You can add a legend to the graph for differentiating multiple lines in the graph in python using matplotlib by adding the parameter label in the matplotlib.pyplot.plot() function specifying the name given to the line for its identity. label ('color') and a sequence of valid color denominations. Is it known that BQP is not contained within NP? In the below example, a 2D list is passed to the numpy.array() function. hBlack = plot (x2, y2, 'k-'); % Plot a black line. Here we will use two list as data with two dimensions (x and y) and at last plot the line with respect to the dimensions. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Control the color order and draw a line at y=0, How can I generate more colors on pie chart matplotlib, How could I get a different pie chart color, MatPlotLib: Given a dataset of 3, graph the 2 and use the 3rd as a label, Python plot time series and emphasize part of it, Matplotlib's equivalent of Matlab's hsv(m), Using matplotlib.pyplot set time series line colors using values from numpy array. Styling with cycler section contains additional Steps. To add a legend to the figure, we set a label for each line while plotting the line by setting the label parameter in the plot() function. I have a bunch of plots as the one reported below. Another simple way is to use the pandas.DataFrame.pivot function to format the data. That is, sets equivalent to a proper subset via an all-structure-preserving bijection. Thanks for contributing an answer to Stack Overflow! Plot a pie chart in Python using Matplotlib. Matplotlib is a multi-platform data visualization library built on NumPy arrays and designed to work with the broader SciPy stack. We've also changed the tick label colors to match the color of the line plots themselves, otherwise, it'd be hard to distinguish which line is on which scale. How do I check whether a file exists without exceptions? How to tell which packages are held back due to phased updates, Bulk update symbol size units from mm to map units in rule-based symbology. If you drop that parameter this fantastic solution will work on all other datasets as well. The difference between the phonemes /p/ and /b/ in Japanese. You can also plot more than one line on the same chart/graph using matplotlib in python. Catch multiple exceptions in one line (except block), Save plot to image file instead of displaying it using Matplotlib. blue squares is drawn below and the bottom row of blue squares is drawn on Copyright 20022012 John Hunter, Darren Dale, Eric Firing, Michael Droettboom and the Matplotlib development team; 20122023 The Matplotlib development team. Plot lines with x and y (x+i/20) using plot () method, with marker=o, linewidth=7 and colors [i] where i is the index. To define x and y data coordinates, use the range () function of python. Is there a single-word adjective for "having exceptionally strong moral principles"? Some markers can be barely seen. 9 ways to convert a list to DataFrame in Python. Radially displace pie chart wedge in Matplotlib, Three-dimensional Plotting in Python using Matplotlib, 3D Scatter Plotting in Python using Matplotlib, 3D Surface plotting in Python using Matplotlib, 3D Wireframe plotting in Python using Matplotlib, 3D Contour Plotting in Python using Matplotlib, Tri-Surface Plot in Python using Matplotlib, Surface plots and Contour plots in Python. Lets import a dataset showing the sales details of a company over 8 years ( 2010 to 2017), you can use any time-series data set. How to display currency format in Flutter, Plot Horizontal and Vertical Line in Matplotlib. How to notate a grace note at the start of a bar with lilypond? A Computer Science portal for geeks. How to Draw Rectangle on Image in Matplotlib? transparent and 1 is fully opaque. EDIT In Dungeon World, is the Bard's Arcane Art subject to the same failure outcomes as other spells? I have been searching for a short solution how to use pyplots line plot to show a time series coloured by a label feature without using scatter due to the amount of data points. Case-insensitive color name from Data Science Stack Exchange is a question and answer site for Data science professionals, Machine Learning specialists, and those interested in learning more about the field. All rights reserved. Is it possible to create a concave light? foreground color with the background color according to the formula. This is the most common way of creating graphs in matplotlib. To plot lines with colors through colormap, we can take the following steps. By default, Matplotlib will assign the color to the line automatically. you mean it is possible to transform the data frame so each column is for a different color, Plotting multiple lines, in different colors, with pandas dataframe, We've added a "Necessary cookies only" option to the cookie consent popup. are in bold. And group them accordingly. Then matplot.pyplot.plot() function is called twice with different x, y parameters to plot two different lines. Mine is mostly just being excessively long for the sake of being excessively long downvoted because this is deprecated in P3, to whit "MatplotlibDeprecationWarning: The set_color_cycle attribute was deprecated in version 1.5. How to create a Scatter Plot with several colors in Matplotlib? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Now, you can see some identical trend of all the lines with the data. Why is there a voltage on my HDMI and coaxial cables? The first color 'C0' is the title. Disconnect between goals and daily tasksIs it me, or the industry? With the use of the fill_between () function in the Matplotlib library in Python, we can easily fill the color between any multiple lines or any two horizontal curves on a 2D plane. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? colors. How can I safely create a directory (possibly including intermediate directories)? Whats the grammar of "For those whose stories they are"? Do new devs get fired if they can't solve a certain bug? The problem with this solution is that I find it not immediate to automate, at least not by using the cycler as shown above. Let's use NumPy to make an exponentially increasing sequence of numbers, and plot it next to another line on the same Axes, linearly: The exponential growth in the exponential_sequence goes out of proportion very fast, and it looks like there's absolutely no difference in the linear_sequence, since it's so minuscule relative to the exponential trend of the other sequence. If you, want different color lines specify color parameter also. How to change angle of 3D plot in Python? In matplotlib, using the keyword argument, we plot multiple lines of the same color. (as noted in a comment this API has been deprecated, more on this later). What do you want to show with the visualization? You can use the new defaults on a per axes object ratio, or you can install temporarily the new default. X11/CSS4 colors. Any help on this would be also appreciated :). How to Make a Time Series Plot with Rolling Average in Python? Do "superinfinite" sets exist? To solve I can use a combination of linestyles and markers when I have more than say 4-5 lines with same color. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? It provides an API (or simply a submodule) called pyplot that contains different types of plots, figures, and related functions to visualize data. In the OP's case it was fine but it will fail for everyone else. How to Change the Transparency of a Graph Plot in Matplotlib with Python? Do "superinfinite" sets exist? Multiple lineplot in seaborn with differnt line styles. If you're just going to be plotting a handful (e.g. Plotting Histogram in Python using Matplotlib, Create a cumulative histogram in Matplotlib. Multiple Plots using subplot () Function Acidity of alcohols and basicity of amines. 00:00 Motivation (from Matplotlib for Storytellers)02:27 Creating the data and figure04:47 Using color_title()09:22 Under the hood with get_window_extent() a. What is the point of Thrower's Bandolier? Plotting Various Sounds on Graphs using Python and Matplotlib, COVID-19 Data Visualization using matplotlib in Python, Analyzing selling price of used cars using Python. Have a look at the colormaps here (gist_ncar is about 2/3 of the way down): http://matplotlib.org/examples/color/colormaps_reference.html. In that case, use a LineCollection. That is, we use Dataframe.groupby to group the colors and then plot the data on the relevant axes. Find centralized, trusted content and collaborate around the technologies you use most. In this example, we will learn how to draw a horizontal line and a vertical line both in one graph with the help of matplotlib. No spam ever. Ah, I assumed he wanted lines from the "now I want to plot this as a line", but on re-reading, you're probably right. Electroencephalography (EEG) is the process of recording an individual's brain activity - from a macroscopic scale. How do I get the row count of a Pandas DataFrame? Is it known that BQP is not contained within NP? a string representation of a float value in [0, 1] inclusive for gray level (e.g., '0.6'). So we change the axes to get a vertical line. How to add a legend to a scatter plot in Matplotlib ? Finally, we call matplotlib.pyplot.legend() to add the figures legend. Their particular You can plot multiple lines from the data provided by an array in python using matplotlib. In this example, well add the title in multiple lines. String representation of float value Create x and y data points using numpy. Unsubscribe at any time. #plot individual lines with custom colors, styles, and widths, How to Calculate a Rolling Mean in Pandas, Mutually Inclusive vs. And 3 lines are plotted on the graph representing the relationship of the 1st column with the other 3 columns of the Dataframe. Lets discuss some concepts: Here we will discuss some examples to draw a line or multiple lines with different features. I want to compare three methods for two different test sets. This does not answer your question, but I think it is important to mention. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. to download the full example code. You can specify the color of the lines in the chart in python using matplotlib. In this example, well learn to add the main title to multiple lines plot. So six plots for one metric in one . You can also set the color and fontsize of the different y-axis labels. How to display the value of each bar in a bar chart using Matplotlib? You can do it by specifying different columns of the array as the x and y-axis parameters in the matplotlib.pyplot.plot() function. In this example, we will learn how to draw multiple lines with the help of matplotlib. equivalent hex shorthand of The It provides a wide variety of plots, tools, and extended libraries for effective data visualization. Asking for help, clarification, or responding to other answers. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? The Matplotlib library of Python is a popular choice for data visualization due to its wide variety of chart types and its properties that can be manipulated to create chart styles. or change altogether the default editing your .matplotlibrc file. MathJax reference. Why is this sentence from The Great Gatsby grammatical? Matplotlib can be used in Python scripts, the Python and IPython shell, web application servers, and various graphical user interface toolkits like Tkinter, awxPython, etc. How to Set a Single Main Title for All the Subplots in Matplotlib? For example, 'blue' maps to '#0000FF' whereas 'xkcd:blue' maps to Now, plot multiple lines using the matplotlib.pyplot.plot() function. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup, Calculation and Visualization of Correlation Matrix with Pandas, Calculation and visualization of islands of influence. colors of each style's rcParams["axes.prop_cycle"] (default: cycler('color', ['#1f77b4', '#ff7f0e', '#2ca02c', '#d62728', '#9467bd', '#8c564b', '#e377c2', '#7f7f7f', '#bcbd22', '#17becf'])). The automatically created legend keeps track of the colour palette defined for each plot but misses the information about the group. Case-insensitive RGB or RGBA string So, in this example we merge the above both graphs to make both lines together in a graph. Create a Dataframe using a dictionary in python containing the population density (per kmsq) and area 100kmsq of some of 20 countries. Providing the colors in the 'color' column exist in matplotlib: List of named colors, they can be passed to the color parameter. There are various colors available in python. You could compute this for each colour/ day of the week. To plot multiple lines in Matplotlib, we keep on calling the matplotlib.pyplot.plot() function for each line and pass the lines coordinates as an argument to the respective plot() function. Prepare some sample data, and then plot the data in the graph using matplotlib.pyplot.plot() as same as done in plotting multiple lines in 2d. How do I execute a program or call a system command? respectively. to have the new cycler used in a group of different plots, reverting to defaults at the end of the context. Lets first prepare the data for the example. Is a PhD visitor considered as a visiting scholar? Relationship between visualization and feature engineering. The segments array for line collection # needs to be (numlines) x (points per line) x 2 (for x and y) points = np.array( [x, y]).T.reshape(-1, 1, 2) segments = np.concatenate( [points[:-1], points[1:]], axis=1) fig, axs = plt.subplots(2, 1, sharex=True, sharey=True) # Create a continuous norm to map from data points to colors norm = in closed interval [0, 1] for By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. In this article, we will learn how to plot multiple lines using matplotlib in Python. Plot x and y data points using plot () method. The code I used to create the markers (with python/matplotlib): However, it would be nice to "distribute the markers in the y direction". Not the answer you're looking for? If you're interested in Data Visualization and don't know where to start, make sure to check out our bundle of books on Data Visualization in Python: 30-day no-question money-back guarantee, Updated regularly for free (latest update in April 2021), Updated with bonus resources and guides. Data Visualization in Python with Matplotlib and Pandas is a book designed to take absolute beginners to Pandas and Matplotlib, with basic Python knowledge, and allow them to build a strong foundation for advanced work with these libraries - from simple plots to animated 3D plots with interactive buttons. The overall trend? to black if cycle does not Here we will use two lists as data with two dimensions (x and y) and at last plot the lines as different dimensions and functions over the same data. How to get different colored lines for different plots in a single figure? I don't want to limit the y axis, I want the markers to appear above a certain threshold, Visualization with many lines, colors, and markers, How Intuit democratizes AI development across teams through reusability. Additionally, we gave them different colors using color parameter and we also adjusted their thickness using linewidth parameter. The problem is that the plot is very crowded and a bit ugly. The data is from measurements performed on different times and different days. are defined by default and are used in a cyclic manner (hence the name Here we will use two lists as data for two dimensions (x and y) and at last plot the line. A Computer Science portal for geeks. How to set border for wedges in Matplotlib pie chart? After importing the dataset, convert the date-time column (Here, Date) to the datestamp data type and sort it in ascending order by the Date column. How to Fill Between Multiple Lines in Matplotlib? And the second way is when we want to add different titles to each plot or subplot, then we use the title() function of pyplot module. I'd like to be able to specify the column color as the set differentiator. visibility of colored lines In Dungeon World, is the Bard's Arcane Art subject to the same failure outcomes as other spells? color cycle). rev2023.3.3.43278. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Copyright 20022012 John Hunter, Darren Dale, Eric Firing, Michael Droettboom and the Matplotlib development team; 20122023 The Matplotlib development team. We will look into both the ways one by one. This can help in the modification of better visualization. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Here we will use two lists as data with two dimensions (x and y) and at last plot the line. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. By default, it cycles through blue, green, red, cyan, magenta, yellow, black: import matplotlib.pyplot as plt import numpy as np x = np.linspace (0, 1, 10) for i in range (1, 6): plt.plot (x, i * x + i, label='$y = {i}x + {i}$'.format (i=i)) plt.legend (loc='best') plt.show () What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Case-insensitive Tableau Colors from Then it's probably best to look at days individually to compare the distributions of functions. How to Connect Scatterplot Points With Line in Matplotlib? However, using more than 4 or 5 linestyles is also bad because they will be barely distinguishable from one another. To make the plot more descriptive, we can add the legend to the plot to infer which line is represented by which color. include color. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. In this example, we use the subplot () function to draw multiple plots, and to add one title use the suptitle () function. Without setting the Y-scale to logarithmic this time, both will be plotted linearly: In this tutorial, we've gone over how to plot multiple Line Plots on the same Figure or Axes in Matplotlib and Python. Overall trend and difference between the days (colors) being the most important things to note and also the easiest to visualize (for the trend you just observe the distribution of the lines. Each plot uses the second and third Matplotlib Server Side Programming Programming. How to Plot Inline and With Qt - Matplotlib with IPython/Jupyter Notebooks, Matplotlib Scatter Plot - Tutorial and Examples, # [0, 1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 10], # [1.00e+00, 3.03e+00, 9.22e+00, 2.80e+01, 8.51e+01, 2.58e+02, 7.85e+02, 2.38e+03, 7.25e+03, 2.20e+04], # Plot linear sequence, and set tick labels to the same color, # Generate a new Axes instance, on the twin-X axes (same position), # Plot exponential sequence, set scale to logarithmic and change tick color, Plot Multiple Line Plots with Different Scales, Plot Multiple Line Plots with Multiple Y-Axis. Overlapping Histograms with Matplotlib in Python. The best answers are voted up and rise to the top, Not the answer you're looking for? It is the data taken at some successive interval of time like stock data, companys sales data, climate data, etc., This type of data is commonly used and needed for the analysis purpose. This results in: Sometimes, you might have two datasets, fit for line plots, but their values are significantly different, making it hard to compare both lines. Thanks! rev2023.3.3.43278. the xkcd palette. precedes a number acting as an index We pass the list of colors to be used in order as an argument to the matplotlib.axes.Axes.set_prop_cycle() method. In matplotlib, to plot a subplot, use the subplot() function. releases was simply a sequence of valid color names (by default a What sort of strategies would a medieval military use against a fantasy giant? Your email address will not be published. (the image is a screenshot from https://vega.github.io/vega/docs/schemes/), The following code shows that the color cycle notion has been deprecated, Now the relevant property is the 'axes.prop_cycle'. Click here The red line should essentially be y=x and the blue line should be y=x^2, Is there a way to make pandas know that there are two sets? Why do small African island nations perform better than African continental nations, considering democracy and human development? In the code below, the value of the figure.figsize parameter in rcParams parameter list is set to (15, 9) to set the figure size global to avoid setting it again and again in different graphs. Lets see examples of a subplot having multiple lines: In the above example, we use the subplot() function to create subplots. The utility toolkit can be enabled by importing the mplot3d library, which comes with your standard Matplotlib installation via pip. Hide Axis, Borders and White Spaces in Matplotlib, Visualization of Merge sort using Matplotlib, Visualization of Quick sort using Matplotlib, 3D Visualisation of Quick Sort using Matplotlib in Python, 3D Visualisation of Merge Sort using Matplotlib, 3D Visualisation of Insertion Sort using Matplotlib in Python. Learn more about Stack Overflow the company, and our products. How to iterate over rows in a DataFrame in Pandas, Pretty-print an entire Pandas Series / DataFrame. Creating Multiple Plots with subplots () Normally we can use the subplots () function to create a single window with a single graph. So, in such cases, you can use a for loop to plot the number of lines by using the matplotlib.pyplotlib.plot() function only once inside the loop, where x and y-axis parameters are not fixed but dependent on the loop counter.

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matplotlib plot multiple lines with different colors