Python——根据条件通过迭代修改列表值的最佳方法

我建议混合使用列表理解和函数定义:

lst = [1, 2, 3, 4]

def replace(x,y=2,z=7):
    """Replace value if condition holds. 

    Keyword arguments:
    x -- value to check for replacement
    y -- x will be replaced if it has the value of y
    z -- x will be replaced by z if x is equal to y
    """
    if(x==y):
        x=z
    return x

lst = [replace(x,2,7) for x in lst]