Python3-comparison-operators-example
提供:Dev Guides
Python 3-比較演算子の例
これらの演算子は、それらの両側の値を比較し、それらの間の関係を決定します。 関係演算子とも呼ばれます。
変数 a が値10を保持し、変数 b が値20を保持すると仮定します-
Operator | Description | Example |
---|---|---|
== | If the values of two operands are equal, then the condition becomes true. | (a == b) is not true. |
!= | If values of two operands are not equal, then condition becomes true. | (a!= b) is true. |
> | If the value of left operand is greater than the value of right operand, then condition becomes true. | (a > b) is not true. |
< | If the value of left operand is less than the value of right operand, then condition becomes true. | (a < b) is true. |
>= | If the value of left operand is greater than or equal to the value of right operand, then condition becomes true. | (a >= b) is not true. |
⇐ | If the value of left operand is less than or equal to the value of right operand, then condition becomes true. | (a ⇐ b) is true. |
例
変数 a が値10を保持し、変数 b が値20を保持すると仮定します-
#!/usr/bin/python3
a = 21
b = 10
if ( a == b ):
print ("Line 1 - a is equal to b")
else:
print ("Line 1 - a is not equal to b")
if ( a != b ):
print ("Line 2 - a is not equal to b")
else:
print ("Line 2 - a is equal to b")
if ( a < b ):
print ("Line 3 - a is less than b" )
else:
print ("Line 3 - a is not less than b")
if ( a > b ):
print ("Line 4 - a is greater than b")
else:
print ("Line 4 - a is not greater than b")
a,b = b,a #values of a and b swapped. a becomes 10, b becomes 21
if ( a <= b ):
print ("Line 5 - a is either less than or equal to b")
else:
print ("Line 5 - a is neither less than nor equal to b")
if ( b >= a ):
print ("Line 6 - b is either greater than or equal to b")
else:
print ("Line 6 - b is neither greater than nor equal to b")
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 equal to b
Line 2 - a is not equal to b
Line 3 - a is not less than b
Line 4 - a is greater than b
Line 5 - a is either less than or equal to b
Line 6 - b is either greater than or equal to b