# 任何对象都有一个bool值，空值或0、FALSE值除外

print(bool(0)) #Fasle
print(bool(1)) # True
print(bool('a')) # True
print(bool(''))
print(bool(None))
print(bool(dict()))
print(bool({}))
print(bool(list()))
print(bool([]))
print(bool(()))
print(bool(tuple()))
print(bool(True)) # True
print(bool(False)) #False

 

举例：

if 3:
    print('good')
else:
    print('no good')
# 输出good