基本数据类型
字符串 ---------n1 = "xiaoxing" n2 = "admin" n3 = "123" n4 = "soft"
数字-----------age = 21 weight = 64 fight = 20
加减乘除等：
字符串：
加法：
n1 = "xiaoxing1"
n2 = "smart"
n4 = "ceshi"
n3 = n1 + n2 + n4
print (n3)
运行结果：xiaoxing1smartceshi
乘法：
n1 = "xiaoxing1"
n3 = n1*5
print(n3)
运行结果；xiaoxing1xiaoxing1xiaoxing1xiaoxing1xiaoxing1
数字：
n1 = 10
n2 = 2
n3 = n1 + n2
n3 = n1 - n2
n3 = n1 * n2
n3 = n1 / n2