Python教程之成员和身份运算符的用法详解_python_

'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")