how to use underscore in python

1def public_api():
2    print ("public api")
3  
4def _private_api():
5    print ("private api")
6

1>>> def function(class):
2  File "<stdin>", line 1
3    def function(class):
4                 ^
5SyntaxError: invalid syntax
6>>> def function(class_):
7...     pass
8...
9>>>
10

1class Prefix:
2...     def __init__(self):
3...             self.public = 10
4...             self._private = 12
5>>> test = Prefix()
6>>> test.public
710
8>>> test._private
912
10

1# Ignore a value of specific location/index
2for _ in range(10)
3    print ("Test")
4  
5# Ignore a value when unpacking
6a,b,_,_ = my_method(var1)
7

1>>> class MyClass():
2...     def __init__(self):
3...             print ("OWK")
4  
5>>> def my_defination(var1 = 1, class_ = MyClass):
6...     print (var1)
7...     print (class_)
8  
9>>> my_defination()
101
11__main__.MyClass
12>>>
13