matplotlib example barchart 1 (snippet)

Python matplotlib example 'barchart 1'

Modules used in program:

• import numpy as np
• import pandas as pd
• import matplotlib.dates as mdates
• import matplotlib.pyplot as plt

python barchart 1

Python matplotlib example: barchart 1

%matplotlib inline
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import pandas as pd
import numpy as np

#load datafile
url1 = 'https://sabopy.com/py/barchart_1'
data = pd.read_html(url1,header=0)[0]
data
'''
Date    Score
0    2018-09-23    6418
1    2018-09-24    16065
2    2018-09-25    5201
3    2018-09-26    8995
4    2018-09-27    22515
5    2018-09-28    8436
6    2018-09-29    13638
'''

Date = data["Date"].values.astype(np.datetime64)
Date
'''
array(['2018-09-23', '2018-09-24', '2018-09-25', '2018-09-26',
       '2018-09-27', '2018-09-28', '2018-09-29'], dtype='datetime64[D]')
'''

Score = data['Score'].values
Score
#array([ 6418, 16065,  5201,  8995, 22515,  8436, 13638])

from pandas.plotting import register_matplotlib_converters
register_matplotlib_converters()

plt.rcParams["font.size"] = 14

fig = plt.figure(figsize=(6, 4))
ax = fig.add_subplot(111)
ax.bar(Date,Score,color = 'pink',edgecolor="black")
ax.xaxis.set_major_formatter(mdates.DateFormatter('%m/%d'))
ax.set_ylabel("Score") # y軸    
plt.savefig("Date_Score.png", dpi=120,transparent = False, bbox_inches = 'tight', pad_inches = 0.05)
plt.show()

Python links

• Learn Python: https://pythonbasics.org/
• Python Tutorial: https://pythonprogramminglanguage.com