import pandas as pd

web_stats = {'Day':[,,,,,],

             'Visitors':[,,,,,],

             'Bounce Rate':[,,,,,]}

df = pd.DataFrame(web_stats)

print(df.head())

   Day  Visitors  Bounce Rate

import pandas as pd

web_stats = {'Day':[,,,,,],

             'Visitors':[,,,,,],

             'Bounce Rate':[,,,,,]}

df = pd.DataFrame(web_stats)

#print(df.head())

print(df.tail())

   Day  Visitors  Bounce Rate

import pandas as pd

web_stats = {'Day':[,,,,,],

             'Visitors':[,,,,,],

             'Bounce Rate':[,,,,,]}

df = pd.DataFrame(web_stats)

#print(df.head())

print(df.tail())

   Day  Visitors  Bounce Rate

import pandas as pd

import pickle

import numpy as np

dates=pd.date_range('',periods=)

df = pd.DataFrame(np.random.randn(,), index=dates, columns=['A','B','C','D'])#生成6行4列位置

print(df)

                   A         B         C         D

--  0.984919 -0.139348  0.160758 -0.251948

--  0.891051 -0.116031  0.491253  0.262518

-- -0.922257  0.761505  0.690123 -1.655246

--  0.524870 -0.704932 -0.734333  0.619541

-- -0.970407 -0.704575 -0.762169  0.829132

-- -1.630999 -1.768938  0.744758 -0.521628