To plot a very simple bar chart from an input text file, we can take the following steps −
Make an empty list for bar names and heights.
Read a text file and iterate each line.
Append names and heights into lists.
Plot the bar using lists (Step 1).
To display the figure, use show() method.
Example
from matplotlib import pyplot as plt
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
bar_names = []
bar_heights = []
for line in open("test_data.txt", "r"):
bar_name, bar_height = line.split()
bar_names.append(bar_name)
bar_heights.append(bar_height)
plt.bar(bar_names, bar_heights)
plt.show()"test_data.txt" contains the following data −
Javed 75 Raju 65 Kiran 55 Rishi 95
Output
