python去掉txt文件行尾换行

枫铃3年前 (2021-09-30)Python245

误区

使用python对txt文件进行读取使用的语句是open(filename, ‘r’)
使用python对txt文件进行写入使用的语句是open(fileneme, ‘w’)
所以如果要通过python对原始文件读取后，直接进行重新写入到原始文件 , 即读到原始文件中有"\n"或"\r\n" 的地方，然后直接删除字符这是不现实的。应该是先通过 open(filename, ‘r’) 读取原始文件内容，再使用open(fileneme, ‘w’) 将删除了行尾回车符的字符串写入到新的文件中。即要做读写分离。

实例

对于原始文件

使用以下语句只是对读出的内容删除了行尾的换行符，而不是真正将修改的结果写入到原始的文件中。

'''
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'''
filename = "./text.txt"
with open(filename, 'r') as f:
    print("open OK")
    for line in f.readlines():
        for a in line:
            # print(a)
            if a == '\n':
                print("This is \\n")
                a = " "
    for line in f.readlines():
        for a in line:
            if a == '\n':
                print("This is \\r\\n")
    for line in f.readlines():
        line = line.replace("\n", " ")
        line = line.strip("\n")

"""open OK
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
This is \n
"""

但是原始文件并没有被修改

正确做法

将文件中的读取后，使用写语句将修改后的内容重新写入新的文件中

with open('./text_1.txt', 'w') as f:
    with open('./text.txt', 'r') as fp:
        for line in fp:
            line = str(line).replace("\n", " ")
            f.write(line)