Python—三目运算

• 2019 年 10 月 3 日
• 笔记

Python ??? if ??????????????????????? if ?????????????????? if ??????????
(True_statements) if (expression) else (False_statements)
???????????????? expression ???????????? True??????? True_statements ???????????? False??????? False_statements ???

?????

>>> isinput = True if input('input: ') else False  input: 996ICU  >>> isinput  True  >>> isinput = True if input('input: ') else False  input:  >>> isinput  False

?????????
?? = ?1 or ?2????? = ?1 if ?1 else ?2
 
??????

>>> content = input('input: ') or 'nothing'  input: 996ICU  >>> content  '996ICU'  >>> content = input('input: ') or 'nothing'  input:  >>> content  'nothing'

???print???

a = 996  b = 666  str_ = '996' if a < b else '666'  print(str_)  print('996' if True else 'icu')  print('996') if False else print('icu')

666  996  icu

Python????????? True_statements ? False_statements ????????
Python ?????????????
1.???????????????????????????????????????

>>> str_ = print('996'), 'True' if 5 > 0 else 'False', 'icu'  996  >>> str_  (None, 'True', 'icu')

2.????????????????????????????????????

>>> str_ = 'icu'; st = 'True' if 5 > 10 else print('ICU')  ICU  >>> str_  'icu'  >>> print(st)  None

??????

print('aaa') if True else (print('bbb') if False else print('ccc'))  print('aaa') if False else (print('bbb') if False else print('ccc'))

aaa  ccc