Python如何在变量中存储打印语句？

Question

我喜欢将两个打印语句保存在2个不同的变量中。 我该怎么办？

 with open(file_to_open) as f:

    for line in f:
        # split the line
        line = line.strip()
        columns = line.split(",")

        if columns[0] == "1":
           print(line, end='')
        if columns[0] == "2":
            print(line, end='')

Answer 1

print(x)函数隐式

1. 呼叫str(x)
2. 显示它
3. 返回None

所以，你不能做

 stored = print(x)

相反，写

stored_value = str(x)

Answer 2

with open(file_to_open) as f:
    for line in f:
    # split the line
        line = line.strip()
        columns = line.split(",")

        if columns[0] == "1":
            def af(line=line):
                print(line, end='')
            a = af
        if columns[0] == "2":
            def bf(line=line):
                print(line, end='')
            b= bf

使用闭包，可以在调用时保存print语句及其参数。然后，您可以在以后任何时候调用此保存的语句。

a()  
b()