python - 如何在 python 中拆分文件？

Question

是否可以拆分文件？例如你有一个巨大的词表，我想把它拆分成多个文件。这怎么可能？

Answer 1

这个用换行符拆分文件并将其写回。您可以轻松更改分隔符。如果您的输入文件中没有多个 splitLen 行(本例中为 20 行)，这也可以处理不均匀的数量。

splitLen = 20         # 20 lines per file
outputBase = 'output' # output.1.txt, output.2.txt, etc.

# This is shorthand and not friendly with memory
# on very large files (Sean Cavanagh), but it works.
input = open('input.txt', 'r').read().split('\n')

at = 1
for lines in range(0, len(input), splitLen):
    # First, get the list slice
    outputData = input[lines:lines+splitLen]

    # Now open the output file, join the new slice with newlines
    # and write it out. Then close the file.
    output = open(outputBase + str(at) + '.txt', 'w')
    output.write('\n'.join(outputData))
    output.close()

    # Increment the counter
    at += 1