Python教程之成员和身份运算符的用法详解

'G' in 'GeeksforGeeks'   # 检查字符串中的“G”
True
'g' in 'GeeksforGeeks'   # 检查字符串中的“g”，因为 Python 区分大小写，返回 False
False
'Geeks' in ['Geeks', 'For','Geeks']   # 检查字符串列表中的“Geeks”
True
10 in [10000,1000,100,10]        # 检查整数列表中的 10
True
dict1={1:'Geeks',2:'For',3:'Geeks'}     # 检查字典键中的 3
3 in dict1
True

# Python 程序说明使用“in”运算符在列表中查找常见成员
list1 = [1, 2, 3, 4, 5]
list2 = [6, 7, 8, 9]
for item in list1:
	if item in list2:
		print("overlapping")
	else:
		print("not overlapping")

# 说明在不使用“in”运算符的情况下在列表中查找常见成员的 Python 程序

# 定义一个接受两个列表的函数（）


def overlapping(list1, list2):

	c = 0
	d = 0
	for i in list1:
		c += 1
	for i in list2:
		d += 1
	for i in range(0, c):
		for j in range(0, d):
			if(list1[i] == list2[j]):
				return 1
	return 0


list1 = [1, 2, 3, 4, 5]
list2 = [6, 7, 8, 9]
if(overlapping(list1, list2)):
	print("overlapping")
else:
	print("not overlapping")

# Python 程序来说明 not 'in' 运算符
x = 24
y = 20
list = [10, 20, 30, 40, 50]

if (x not in list):
	print("x is NOT present in given list")
else:
	print("x is present in given list")

if (y in list):
	print("y is present in given list")
else:
	print("y is NOT present in given list")
复制代码

# Python程序说明'is'恒等运算符的使用
x = 5
y = 5
print(x is y)
id(x)
id(y)

# Python程序说明'is not'恒等运算符的使用
x = 5
if (type(x) is not int):
	print("true")
else:
	print("false")

# Prints True
x = 5.6
if (type(x) is not int):
	print("true")
else:
	print("false")