Python 2:如何在".txt"文档中添加字符串？

Question

我有一个名为'new_data.txt'的'.txt'文档.现在它是空的.但是我在'for'循环中有一个'if'语句,如果'x'偶数与否则会出现.如果我想要(x +'是偶数!')添加到我的'new_data.txt'文档中.

for x in range(1,101):
    if x % 2 == 0:
        # and here i want to put something that will add: x + ' is even!' to my 'new_data.txt' document.

我怎样才能做到这一点？

Answer 1

要使用Python写入文件,请使用with语句和open内置函数:

# The "a" means to open the file in append mode.  Use a "w" to open it in write mode.
# Warning though: opening a file in write mode will erase everything in the file.
with open("/path/to/file", "a") as f:
    f.write("(x + ' is even!')")

完成后,该with语句负责关闭文件.

此外,在您的脚本中,您可以简化它并执行:

with open('/path/to/file','a') as file:
    for x in [y for y in range(1,101) if not y%2]:
        file.write(str(x)+' is even!\n')

这将取1到101之间的每个偶数,并以"x is even!"格式将其写入文件.