下面是一个使用locals()函数判断变量是否已定义的示例代码: defcheck_variable_defined():variable_name='x'ifvariable_nameinlocals():print(variable_name,'is defined')else:print(variable_name,'is not defined')check_variable_defined() 1. 2. 3. 4. 5. 6. 7. 8. 以上代码中,我们定义了一个函数c...
Usage:pipenv[OPTIONS]COMMAND[ARGS]...Options:--where Output project home information.--venv Output virtualenv information.--py Output Python interpreter information.--envs Output Environment Variable options.--rm Remove the virtualenv.--bare Minimal output.--man Display manpage.--support Output diag...
0: No space allowed before : if __name__ == '__main__' : ^ (bad-whitespace) F: 54, 0: Unable to import '__pkginfo__' (import-error) C: 57, 0: Invalid constant name "distname" (invalid-name) C: 58, 0: Invalid constant name "scripts" (invalid-name) C: 59...
return 'Hello ' + name 然后运行: $ mypy greeting.py 尽管您必须安装 Python 3 才能运行 mypy,但 mypy 也能对 Python 2 代码进行类型检查:只需传入--py2标志即可。 $ mypy --py2 greeting.py 我们也可以给参数设置默认值: def greeting(name: str, excited: bool = False) -> str: ...
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path to the compiler, or to the compiler name if it is in the PATH. -- Configuring incomplete, errors occurred! See also "/home/onion/桌面/pycdc/CMakeFiles/CMakeOutput.log". ...
+variable = "abcd" # this doesn’t work ▍20、数字的第一位不能是0 number = 0110 # this doesn't work 这个确实挺神奇的。 ▍21、在变量名的任何地方使用下划线 a___b = "abcd" # this works _a_b_c_d = "abcd" # this also works 这并不意味着,你可以无限使用,为了代码的易读性,还是需...
total *= numberreturntotalif__name__ =='__main__': multiply({"10","20"}) 结果如下: $ mypy main.py main.py:9: error: Incompatible typesinassignment (expression hastype"float", variable hastype"int") main.py:14: error: Argument1to"multiply"has incompatibletype"Set[str]"; expected...
NameError: name 'raw_input' is not defined 由于python3.x系列不再有 raw_input函数,3.x中 input 和从前的 raw_input 等效,把raw_input换成input即可。 SyntaxError: multiple statements found while compiling a single statement 这是因为整体复制过去运行而产生的错误;解决方案如下: ...
viewrawcheck_memory_usage_2.py hosted with by GitHub 6. 返回多个值 Python中的函数可以返回多个变量，而无需字典、列表或类。它的工作原理如下：defget_user(id): # fetch user from database # ... return name, birthdatename, birthdate = get_user(4)viewrawreturn_multiple_variabl...
Alternately, you can use a custom environment variable that's defined on each platform to contain the full path to the Python interpreter to use, so that no other folder paths are needed. If you need to pass arguments to the Python interpreter, you can use thepythonArgsproperty. ...