59 lines
1.2 KiB
Python
59 lines
1.2 KiB
Python
"""
|
|
This code is supported by the website: https://www.guanjihuan.com
|
|
The newest version of this code is on the web page: https://www.guanjihuan.com/archives/45201
|
|
"""
|
|
|
|
# False 布尔值
|
|
print(bool(False))
|
|
print(bool(0))
|
|
print(bool(0.0))
|
|
print(bool(0.0j))
|
|
print(bool(None))
|
|
print(bool(''))
|
|
print(bool([]))
|
|
print(bool({}))
|
|
print(bool(()))
|
|
print(bool(set()))
|
|
print()
|
|
|
|
# 虽然布尔值相同，但只有 False, 0, 0.0, 0.0j 和 False 等价
|
|
print(False==False) # True
|
|
print(False==0) # True
|
|
print(False==0.0) # True
|
|
print(False==0.0j) # True
|
|
print(False==None) # False
|
|
print(False=='') # False
|
|
print(False==[]) # False
|
|
print(False=={}) # False
|
|
print(False==()) # False
|
|
print(False==set()) # False
|
|
print()
|
|
|
|
def true_or_false(a):
|
|
if a:
|
|
print('True')
|
|
else:
|
|
print('False')
|
|
|
|
# 'if' 环境中的 False 测试
|
|
true_or_false(False)
|
|
true_or_false(0)
|
|
true_or_false(0.0)
|
|
true_or_false(0.0j)
|
|
true_or_false(None)
|
|
true_or_false('')
|
|
true_or_false([])
|
|
true_or_false({})
|
|
true_or_false(())
|
|
true_or_false(set())
|
|
print()
|
|
|
|
# 'if' 环境中的 True 测试
|
|
true_or_false(True)
|
|
true_or_false('True')
|
|
true_or_false('False')
|
|
true_or_false('a')
|
|
true_or_false(1)
|
|
true_or_false(-1)
|
|
true_or_false(2)
|
|
print() |