python的简单代码

python的简单代码有很多种，以下是几个例子：

1. 计算两个数的和：

a = 5
b = 3
sum = a + b
print(sum)

输出：8

2. 判断一个数是否为偶数：

num = 6
if num % 2 == 0:
    print("偶数")
else:
    print("奇数")

输出：偶数

3. 打印九九乘法表：

for i in range(1, 10):
    for j in range(1, i + 1):
        print(i, "*", j, "=", i * j, end="\t")
    print()

输出：
1 * 1 = 1
2 * 1 = 2 2 * 2 = 4
3 * 1 = 3 3 * 2 = 6 3 * 3 = 9
4 * 1 = 4 4 * 2 = 8 4 * 3 = 12 4 * 4 = 16
5 * 1 = 5 5 * 2 = 10 5 * 3 = 15 5 * 4 = 20 5 * 5 = 25
6 * 1 = 6 6 * 2 = 12 6 * 3 = 18 6 * 4 = 24 6 * 5 = 30 6 * 6 = 36
7 * 1 = 7 7 * 2 = 14 7 * 3 = 21 7 * 4 = 28 7 * 5 = 35 7 * 6 = 42 7 * 7 = 49
8 * 1 = 8 8 * 2 = 16 8 * 3 = 24 8 * 4 = 32 8 * 5 = 40 8 * 6 = 48 8 * 7 = 56 8 * 8 = 64
9 * 1 = 9 9 * 2 = 18 9 * 3 = 27 9 * 4 = 36 9 * 5 = 45 9 * 6 = 54 9 * 7 = 63 9 * 8 = 72 9 * 9 = 81

4. 判断一个字符串是否为回文字符串：

def is_palindrome(s):
    return s == s[::-1]

string = "level"
if is_palindrome(string):
    print("是回文字符串")
else:
    print("不是回文字符串")

输出：是回文字符串