Python for循环可以遍历任何的项目，如一个列表或者字符串。语法：for i in a:print(i)实例：a = "python"for i in a:print(i)b=["ab","bc","cd","de"]for i in b:print(i)运行结果：pythonabbccdderange()函数：生成一个整数列表常用在for循环中for i in range(7): #ran