python - TypeError:不支持的格式字符串传递给 NoneType.__format__

Question

first_name = input("what is your first name?")
Last_name = input("what is your last name?")

name = f'{first_name}, {Last_name}'

print("hello, {} welcome to the program!").format(name)

Answer 1

print 返回 None - 您可能打算格式化一个字符串，然后将其传递给 print - 换句话说，您的括号放错了位置:

print("hello, {} welcome to the program!".format(name))