pythoncsv按内容切分_如何在python中分割CSV文件？

在第二到最后一个文件中，你必须添加原始文件的第一行(包含标题的第一行)：# this loads the first file fully into memory

with open(‘#’, ‘r’) as f:

csvfile = f.readlines()

linesPerFile = 1000000

filename = 1

# this is better then your former loop, it loops in 1000000 lines a peice,

# instead of incrementing 1000000 times and only write on the millionth one

for i in range(0,len(csvfile),linesPerFile):

with open(str(filename) + ‘.csv’, ‘w+’) as f:

if filename > 1: # this is the second or later file, we need to write the

f.write(csvfile[0]) # header again if 2nd…. file

f.writelines(csvfile[i:i+linesPerFile])

filename += 1

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