将纯字符串写入python中的文件

Question

I have str = 'some words\\n' and i want to print it to file with

with open(newfile, 'a') as the_file:
    the_file.write(str)

how can i write literally just 'some words\\n' not 'some words' with enter at the end?

Answer 1

请尝试使用doule反斜杠，例如str = "some words \\\\n" 。

Answer 2

You need to escape the escape character:

str = 'some words\n'
with open(newfile, 'a') as the_file:
    str = str.replace("\n","\\n")
    the_file.write(str)

Answer 3

You can use the raw-string r'..' construct to do that, also would be nice to use the file-open constructs within the try catch blocks and close the open file descriptor once the write is complete.

try:
    str = r'some words\n'
    with open('newfile', 'a') as fd:
        fd.write(str)
        fd.close()

except IOError as e:
    print('unable to open file newfile in append mode')

Answer 4

string = "some words\n"

with open("temp.txt", "w+") as fp:

        temp = string[:-2] + r'\n'

        fp.write(temp)

Answer 5

You could use the string representation without the quotes. It will work with all escape sequences, not only the '\\n':

w = "some\twords\n"
repr(w)[1:-1] # some\twords\n

However there is an issue with quotes:

w = '''single'double"quote'''
repr(w)[1:-1] # single\'double"quote