Python documentation - File and Directory Access
读取文件
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| f = open('filename.txt', 'r')
# 读取全部内容
f.read()
# # 读取指定位置字符
f.read(4)
# 读单行
f.readline()
# 读多行
f.readlines()
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迭代目录
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| import os
directory = os.fsencode(directory_in_str)
for file in os.listdir(directory):
filename = os.fsdecode(file)
print(os.path.join(directory, filename))
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迭代文件行
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| for line in open('filename.txt', mode="r", encoding="utf-8"):
print(line)
file = open('filename.txt', mode="r", encoding="utf-8")
while True:
line = file.readline()
if not line: break
print(line)
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写入文件
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| # 覆盖模式
file = open('filename.txt', 'w')
# 追加模式
file = open('filename.txt', 'a')
file.write('abc\n12345')
file.writelines('\nnew line')
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