Question

我正在尝试通过用output.dat替换超过1的值来处理文件1。例如，如果文件包含如下数字：

我希望输出为：

Answer 1

如果文件不是很大，请阅读过滤任何行的所有行＆gt; 1，然后重新打开覆盖：

with open(infile) as f:
    lines = ["1\n" if int(line) > 1 else line for line in f]
    with open(infile, "w") as out:
        out.writelines(lines)

输出：

这假设所有行都只包含您的示例中的数字。

或fileinput.input使用inplace=True：

import  fileinput
for line in fileinput.input(infile,inplace=True):
    if int(line) > 1:
        print("1")
    else:
        print(line.rstrip()) # python3 print(line,end="")

按原样保留前两行：

with open(infile) as f:
    skip = next(f),next(f)
    lines = ("1\n" if int(line) > 1 else line for line in f)
    with open(infile, "w") as out:
        out.writelines(skip)
        out.writelines(lines)

或者使用枚举，留下索引为＆lt;的前n行。 1：

with open(infile) as f:
        lines = ("1\n" if int(line) > 1 and ind > 1 else line for ind, line in enumerate(f))
        with open(infile, "w") as out:
            out.writelines(lines)

python：在条件下替换文件中的字符

1 个答案: