# 交换两个变量的值
a = 100
b = 200
# 方法1
# a = a + b
# b = a - b
# a = a - b
# print( "a是%d" % a)
# print("b是%d" % b)
# 方法2
a, b = b, a
print( "a是%d" % a)
print("b是%d" % b)
# 交换两个变量的值
a = 100
b = 200
# 方法1
# a = a + b
# b = a - b
# a = a - b
# print( "a是%d" % a)
# print("b是%d" % b)
# 方法2
a, b = b, a
print( "a是%d" % a)
print("b是%d" % b)
Java交换map的key和value值
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