Python3-membership-operators-example

Python 3-メンバーシップ演算子の例

Pythonのメンバーシップ演算子は、文字列、リスト、タプルなどのシーケンスのメンバーシップをテストします。 以下に説明するように2つのメンバーシップ演算子があります-

Operator	Description	Example
in	Evaluates to true if it finds a variable in the specified sequence and false otherwise.	x in y, here in results in a 1 if x is a member of sequence y.
not in	Evaluates to true if it does not finds a variable in the specified sequence and false otherwise.	x not in y, here not in results in a 1 if x is not a member of sequence y.

例

#!/usr/bin/python3

a = 10
b = 20
list = [1, 2, 3, 4, 5 ]

if ( a in list ):
   print ("Line 1 - a is available in the given list")
else:
   print ("Line 1 - a is not available in the given list")

if ( b not in list ):
   print ("Line 2 - b is not available in the given list")
else:
   print ("Line 2 - b is available in the given list")

c = b/a
if ( c in list ):
   print ("Line 3 - a is available in the given list")
else:
   print ("Line 3 - a is not available in the given list")

出力

上記のプログラムを実行すると、次の結果が生成されます-

Line 1 - a is not available in the given list
Line 2 - b is not available in the given list
Line 3 - a is available in the given list