python - Generating a matlibplot bar chart from two columns of data -

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i trying build vertical bar chart based on examples provided in how plot simple bar chart (python, matplotlib) using input *.txt file? , pylab_examples example code: barchart_demo.py.

# bar chart import numpy np import matplotlib.pyplot plt  data = """100 0.0       5 500.25       2 10.0       4 5.55       3 950.0       3 300.25"""  counts = [] values = []  line in data.split("\n"):     x, y = line.split()     values = x     counts = y  plt.bar(counts, values)  plt.show()

current receiving following error: assertionerror: incompatible sizes: argument 'height' must length 15 or scalar. not sure if plt.bar() function defined correctly. there may other issues have overlooked in trying replicate 2 mentioned examples.

x, y = line.split() returns tuple of strings. believe need convert them ints , floats. need values.append(x) , values.append(y).

import numpy np import matplotlib.pyplot plt  data = """100 0.0       5 500.25       2 10.0       4 5.55       3 950.0       3 300.25"""  counts = [] values = []  line in data.split("\n"):     x, y = line.split()     values.append(int(x))     counts.append(float(y))  plt.bar(counts, values)  plt.show()

given 100 value in first line (compared <= 5 rest), makes pretty ugly bar chart though.


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