True in Python python, false condition judgment

Programmers with programming experience know the wording of conditional statements:

Take C + + as an example:

if (condition) {    dosomething ();}

The syntax for conditional judgments in Python is as follows:

if (condition):    dosomething ()

So when is the condition in the conditional statement true and false?

In high-level languages such as C++/java, the condition is false if the value of the condition is 0 or if the referenced object is a null pointer.

In Python if condition is ", (), [],{},none,set () then the condition is flase, otherwise true.

The following is a test statement for Python:

1. Testing for strings

>>> condition= ' >>> print ' True ' if condition Else ' False ' false>>> condition= ' test ' >> > print ' true ' if condition Else ' False ' true

2. Testing for the original group

>>> condition= () >>> print ' True ' if condition Else ' False ' false>>> condition= ($) >> > print ' true ' if condition Else ' False ' true

3. Testing for the list

>>> condition=[]>>> print ' True ' if condition Else ' False ' false>>> condition=[' A ', ' B ']> >> print ' true ' if condition Else ' False ' true

4. Testing for Dictionaries

>>> condition={}>>> print ' True ' if condition Else ' False ' false>>> condition={' k ': ' V '}> >> print ' true ' if condition Else ' False ' true

5. Test for None

>>> condition=none>>> print ' True ' if condition Else ' false ' false

6. Test for Set ()

>>> condition=set () >>> print ' True ' if condition Else ' False ' false>>> condition.add (' a ') >>> print ' true ' if condition Else ' False ' true

True in Python python, false condition judgment