其他宣告

if condition:
    body
else:
    body

只有在前面的條件語句全部計算為 False 時，else 語句才會執行它的主體。

if True:
    print "It is true!"
else:
    print "This won't get printed.."

# Output: It is true!

if False:
    print "This won't get printed.."
else:
    print "It is false!"

# Output: It is false!