017 Data Type: Boolean

A Boolean value (bool)

1.1 What is a Boolean type

Boolean data type is the same, he appeared in the conditions used to determine the results, such as True (true) or False (false)

1.2 Definitions Method

True, False usually not directly quoted, required logic operation result obtained.

1.3 Use

print(type(True))
print(True)

Output:

​ <class 'bool'>
​ True

print(bool(0))
print(bool('xucheng'))
print(bool(1 > 2))
print(bool(1 == 1))

Output:

​ False
​ True
​ False
​ True

Note: Python values of all data types comes Boolean value. So much data types only need to remember only 0, None, an empty, False Boolean value is False, the rest to True.

print(bool(0))
print(bool(None))
print(bool(''))
print(bool([]))
print(bool({}))
print(bool(False))

Output:
False
False
False
False
False
False