先输入 exit()，退出交互式python，提示符应该显示和你图二的第一行一致 然后输入python day4.py即可运行已经写好的day4.py代码。交互式模式不用于执行文件，而是执行手动输入的代码
File"<stdin>", line1,in<module> NameError: name'sys'isnotdefined. Did you forget toimport'sys'? 当实例内报NameError时也会提示问题原因,比如成员方法引用了未定义的变量,而这个变量名又和成员变量名相同时会提示用户是否忘记加self,比如 >>>classA:...
>>> sys.version_info Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'sys' is not defined. Did you forget to import 'sys'? 当实例内报NameError时也会提示问题原因,比如成员方法引用了未定义的变量,而这个变量名又和成员变量名相同时会提示用户是否忘记...
File"<stdin>", line1,in<module> NameError: name'sys'isnotdefined. Did you forget toimport'sys'? 当实例内报NameError时也会提示问题原因,比如成员方法引用了未定义的变量,而这个变量名又和成员变量名相同时会提示用户是否忘记加self,比如 >>>classA: ...def__init__(self): ... self.blech =1 ...
NameError: name 'sys' is not defined. Did you forget to import 'sys'? 当实例内报NameError时也会提示问题原因,比如成员方法引用了未定义的变量,而这个变量名又和成员变量名相同时会提示用户是否忘记加self,比如 >>> class A: ... def __init__(self): ...
元组少了括号>>> {x,y for x,y in zip('abcd', '1234')} File "<stdin>", line 1 {x,y for x,y in zip('abcd', '1234')} ^SyntaxError: did you forget parentheses around the comprehension target?字典少了逗号>>> items = {... x: 1,... y: 2... z: 3, File "<s...
If you code infrequently, you likely forget to put quotes around your strings often. This is a very common mistake, so rest assured thatyou're not alone! Forgotten quotes can sometimes result in this crypticinvalid syntaxerror message:
>>> {x,y for x,y in zip('abcd', '1234')} File "<stdin>", line 1 {x,y for x,y in zip('abcd', '1234')} ^ SyntaxError: did you forget parentheses around the comprehension target? 字典少了逗号 >>> items = { ... x: 1, ... y: 2 ... z: 3, File "<stdin>", lin...
File "<stdin>", line 1, in<module>NameError: name 'sys' is not defined. Did you forget to import 'sys'? 1. 2. 3. 4. 或者,当方法引发 NameError 时也会提示问题原因: >>> class A: ... def __init__(self): ... self.blech = 1 ...
If you’re new to Python and are just starting out with tuples, then you should know about a couple of gotchas that can cause subtle issues in your code. Arguably, the most common gotcha with tuples is to forget the trailing comma when defining one-item tuples: Python >>> numbers ...