基于mas的Python排序

Question

我有一些短信：

228;u;Ali;
129;cr;Daan;
730;c;Arton;
466;cr;Frynk;
314;c;Katuhkay;
9822;c;Kinberley;

我想把这个文本写到文件中，但我只想写带有符号“；cr；”的行

Answer 1

with open("input.csv", "r") as inp, open("output","w") as out:
    inpList = inp.read().split()
    out.write('\n'.join(el for el in inpList if ';cr;' in el))

如果要从web上读取数据，请使用以下方法：

^{pr2}$

read()一次读取整个文件。split()将其拆分为一个由空格分隔的列表。在

read(...)
    read([size]) -> read at most size bytes, returned as a string.

    If the size argument is negative or omitted, read until EOF is reached.

为了写入文件，'\n'.join([elem1,...])从包含“；cr；”的所有inpList元素创建一个字符串。此字符串被传递到write(str)，后者将字符串打印到输出文件。在

Answer 2

像这样：

with open("input.txt") as f,open("output.txt","w") as f2:
    for line in f:                #iterate over each line of input.txt
        if ";cr;" in line:        #if ';cr;' is found
            f2.write(line+'\n')      #then write that line to "output.txt"

在python中，可以使用in轻松检查子字符串：

^{pr2}$