Python 使用链式连接和一个空格字符串\“\&引用;

Python 使用链式连接和一个空格字符串\“\&引用;,python,pycharm,Python,Pycharm,结果 world = 'World' hello_world =hello +''+ World print(hello_world) # Note: you should print "Hello World" 回溯(最近一次呼叫最后一次): /PycharmProjects/Python简介/Strings/Concatenation/Concatenation.py”,第4行,中 hello_world=hello+“”+world NameError:未定义名称“World

结果

world = 'World'

hello_world =hello +''+ World
print(hello_world)      # Note: you should print "Hello World"
回溯(最近一次呼叫最后一次):
/PycharmProjects/Python简介/Strings/Concatenation/Concatenation.py”,第4行,中
hello_world=hello+“”+world
NameError:未定义名称“World”
进程已完成,退出代码为1

Python变量区分大小写,因此变量
World
World
不同


hello\u world=hello+''+world
应该是
hello\u world=hello+''+world
world
!=
world
变量名区分大小写如何发送屏幕截图?您定义了hello吗?如果没有,您需要在工作之前这样做hello=“hello=”“world=‘world’hello_world=hello+”“+world print(hello_world)#注意:您应该打印“hello world”
Traceback (most recent call last):
  /PycharmProjects/Introduction to Python/Strings/Concatenation/concatenation.py", line 4, in <module>
    hello_world =hello +''+ World
NameError: name 'World' is not defined

Process finished with exit code 1