python - 这个语法错误的原因是什么

Question

我想知道为什么我的代码不起作用。它不是一个字符串吗？我的月经会影响我的代码吗？在某处引用？

def intro(name,school):
    return "Hello. My name is" + str(name). + "I go to" + str(school).

Answer 1

您的脚本返回一个语法错误，因为您不能通过str(name). 向字符串添加句号，但它也必须作为字符串添加str(名称) + "."

def intro(name,school):
    return "Hello. My name is " + str(name) + "." + " I go to " + str(school) + "."

print intro('kevin','university of wisconsin')

这将打印 (注意我添加的额外空格，"I go to" 替换为 "I go to " 以便输出更多可读):

Hello. My name is kevin. I goto university of wisconsin.

但是你可以使用format()方法来克服字符串添加的复杂性:

def intro(name,school):
    return "Hello. My name is {0}. I goto {1}.".format(name,school)

print intro('kevin','university of wisconsin')

输出:

Hello. My name is kevin. I goto university of wisconsin.

请注意:如评论中所述here你不能使用:

print intro(kevin,university of wisconsin) 因为它会带来语法错误，为什么？，因为变量不能有空格，字符串必须有引号或者 python 认为 kevin 是一个变量 但你总是欢迎这样做:

name = 'kevin'
school = 'university of wisconsin'

def intro(name,school):
    return "Hello. My name is " + str(name) + "." + " I go to " + str(school) + "."
    #return "Hello. My name is {0}. I goto {1}.".format(name,school)

print intro(name,school)