__doc__ #This is self-defined function # #Do nothing 五、模块 模块就是一个包含了所有你定义的函数和变量的文件,模块必须以.py为扩展名。模块可以从其他程序中‘输入’(import)以便利用它的功能。 在python程序中导入其他模块使用’import’, 所导入的模块必须在sys.path所列的目录中,因为sys
except to catch an exception, you sometimes don’t need to do anything about the exception. In that situation, you can use the pass statement to silence the error. If you want to make sure a file doesn’t exist, then you can use os.remove(). This function will raise an error if ...
Python decorators.py def do_twice(func): def wrapper_do_twice(*args, **kwargs): func(*args, **kwargs) func(*args, **kwargs) return wrapper_do_twice The wrapper_do_twice() inner function now accepts any number of arguments and passes them on to the function that it decorates. ...
False , await, else, import, pass, None, break , except , in, raise, True, class, finally, is, return, and, continue, for, lambda, try, as, def, assert, del, async, elif, from, nonlocal, while, global, not, with, if, or, yield Within a Python program, you can find the ...
except ImportError: pass # If pyperclip is not installed, do nothing. It's no big deal. # Every possible symbol that can be encrypted/decrypted: LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' def main(): print('''Simple Substitution Cipher, by Al Sweigart A simple substitution cipher has a one-to...
# do something # exit exit(0) 输出结果为: os.getpid()=3192 object created in __name__='__main__' parent process os.getpid()=3192, child process pid=3193 os.getpid()=3192 object deleted in __name__='__main__' os.getpid()=3193 object deleted in __name__='__main__' ...
This implementation provides a clean and reliable way of calling any needed cleanup functionality upon normal program termination. Obviously, it’s up tofoo.cleanupto decide what to do with the object bound to the nameself.myhandle, but you get the idea. ...
If you do it on separate lines, it doesn't "know" that there's already "wtf!" as an object (because "wtf!" is not implicitly interned as per the facts mentioned above). It's a compile-time optimization. This optimization doesn't apply to 3.7.x versions of CPython (check this ...
except StopIteration: ... pass >>> def logic(): ... s = "mylogic" ... r = yield s ... print r >>> framework(logic) [FX] logic: mylogic [FX] do something 78 async:mylogic 尽管 framework 变得复杂了⼀一些,但却保持了 logic 的完整性.blocking style 样式的编码给逻 辑维护带来...
except:return"Unknown"def suicide(signum, e):globalchild_process print>> sys.stderr,"[Error] DataX receive unexpected signal %d, starts to suicide."%(signum)ifchild_process: child_process.send_signal(signal.SIGQUIT) time.sleep(1) child_process.kill() ...