print 'test.py -i -o ' sys.exit(2) for opt, arg in opts: if opt == '-h': print 'test.py -i -o ' sys.exit() elif opt in ("-i", "--ifile"): inputfile = arg elif opt in ("-o", "--ofile"): outputfile = arg print '输入的文件为:', inputfile print '输出的...
if condition_b: # do something # and then exit the outer if block # more code here 我可以想到一种方法来做到这一点:假设退出情况发生在嵌套的 if 语句中,将剩余的代码包装在一个大的 else 块中。例子: if some_condition: ... if condition_a: # do something # and then exit the outer if ...
pip).[envvar:PIPENV_CLEAR]-v,--verbose Verbose mode.--pypi-mirrorTEXTSpecify a PyPI mirror.--version Show the version and exit.-h,--help Showthismessage and exit.Usage Examples:Create anewprojectusing Python3.7,specifically:$ pipenv--python3.7Remove projectvirtualenv(inferred from current...
def __exit__(self, exc_type, exc_value, traceback): import sys sys.stdout.write = self.original_write if exc_type is ZeroDivisionError: print('Please DO NOT divide by zero!') return True if __name__ == "__main__": with LookingGlass() as what: print('Alice, Kitty and Snowdrop...
/bin/env python # coding=gb2312 # -*- coding: gb2312 -*- from __future__ import division ### if-else...: ", a else: print "max: ", b ### if-elif-else ###...
if [ $a -gt $b ];then big_num=$a else big_num=$b fi echo $big_num 3. Python a = 3 b = 5 if a > b: big_num = a else: big_num = b print(big_num) 十、Python的执行过程与.pyc文件 在之前的文章我们已经解释过:Python是一个动态的、强类型的、解释型的编程语言。而实际上,解...
我们习惯于if/else语句,但是往往忽略,python中for, while, try语句也能跟else子句: for当循环运行完毕时(没被break),才会运行else块 while当循环因为条件为假而退出(没被break),才会运行else块 try当块中没有异常抛出时才会运行else块 虽然说这里使用的关键词是else,但是其实使用then更符合其语义:先(成功)做这个...
(): if event.type == pygame.QUIT: pygame.quit() sys.exit() # --玩家一: ↑↓←→控制, j射击; 玩家二: wsad控制, 空格射击 pressed_keys = pygame.key.get_pressed() for idx, player in enumerate(player_group): direction = None if idx == 0: if pressed_keys[pygame.K_UP]: ...
} # Function main if [ $# -eq 1 ];then case $1 in -c|create) env_check generate_license ;; -s|showmac) show_mac ;; *) show_usage exit 1 esac else show_usage exit 1 fi 复制 查看使用说明 获取MAC地址 生成License 上一篇Python的License授权机制 下一篇node开发一个接口详细步骤 本文...
同quit(),exit()的出现更多是出于用户友好的目的(因为 exit() 更常见一些,更符合用户习惯一些?) # Python program to demonstrate# exit()foriinrange(10):# If the value of i becomes# 5 then the program is forced# to exitifi ==5:# prints the exit messageprint(exit) ...