使用带if条件的lambda滤波器

Question

friends_filter = ["Osama", "Wessam", "Amal", "Essam", "Gamal", "Othman"]
namess = filter(lambda names: names if names[-1].lower() == 'm', friends_filter)
for name in namess:
    print(name)

为什么它在列表名之前给我错误（语法错误）

Answer 1

谓词只需返回比较结果，而不必返回值本身

friends_filter = ["Osama", "Wessam", "Amal", "Essam", "Gamal", "Othman"]
namess = filter(lambda names: names[-1].lower() == 'm', friends_filter)
for name in namess:
    print(name)

Answer 2

出现语法错误，因为内联if需要else语句。但在lambda表达式中不必使用内联if if names[-1].lower() == 'm' else None