Drawing A Line Chart Using Pandas DataFrame

Line Chart:

  • A line chart plots a set of (x, y) values in a two-dimensional plane and connects those data points through straight lines.
  • A line chart is one of the most commonly used charts to understand the relationship, trend of one variable with another.

Drawing a Line chart using pandas DataFrame in Python:

  • The DataFrame class has a plot member through which several graphs for visualization can be plotted. A line chart or line graph is one among them.
  • Calling the line() method on the plot instance draws a line chart. If the column name for X-axis is not specified, the method takes the index of the column as the X-axis, which is of the pattern 0, 1, 2, 3 and so on.
  • After drawing the X-axis from the index of the DataFrame or using the specified column, the subsequent numeric columns are plotted as lines against the X-axis.

Example:

# Example Python program to plot a line chart

# for a pandas DataFrame

import pandas as pd

import matplotlib.pyplot as plot

 

# Earnings data for 4 quarters as a Python Dictionary

earningsData = {"Quarterly Profit": [9.3, 9.7, 8.9, 10.2],

                "Quarterly Revenue": [12.7, 14.0, 12.5, 14.7]

               };

             

df = pd.DataFrame(data=earningsData);

 

# Draw a line chart

df.plot.line(title="Quarterly earnings and profit of an organization");

plot.show(block=True);

 

Output:

Line chart drawn for a pandas DataFrame

Example-X-Axis drawn from a specific column of a pandas DataFrame: 

# Example Python program to plot a line chart

# for a pandas DataFrame - with X-Axis drawn using a DataFrame column

import pandas as pd

import matplotlib.pyplot as plot

 

stockIndex = {"Year":  ["2015", "2016", "2017", "2018"],

              "Index": [35000, 33000, 34000, 36000],

              "Market Cap in Billions":[5000, 4700, 4800, 5700]

              };

             

df = pd.DataFrame(data=stockIndex);

df.plot.line(x="Year", title="Value of Stock Index between 2015 and 2018");

plot.show(block=True);

Output:

Line chart - X axis drawn from a DataFrame Column


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