January 23 "Basic knowledge of Python3"

January 23 "Basic knowledge of Python3"

3.1 If/while/for
3.2 Solving Math Puzzles
3.3 Python Instance

3.1 If/while/for

‘‘‘#if 判断条件：    执行语句elif 判断条件：    执行语句else:    执行语句#while 判断条件：    执行语句# break: 跳出循环#continue: 跳出当次循环#for item in sequence:    执行语句‘‘‘# lsit 遍历l = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘]for x, y in enumerate(l):    print(x, y)

3.2 Solving Math Puzzles

# ABCD * 9 = DBCA  答案：A=1 B=0 C=8 D=9for A in range(1, 10):    for B in range(0, 10):        for C in range(0, 10):            for D in range(1, 10):                start = 1000 * A + 100 * B + 10 * C + D                end = 1000 * D + 100 * C + 10 * B + A                if start * 9 == end:                    print("A={0};B={1};C={2};D={3}".format(A, B, C, D))                    print("{0} * 9 = {1}".format(start, end))

3.3 Python Instance

# 阶乘相加def one(n):    total = 1    if n == 0:        total = 1    else:        for i in range(1, n+1):            total *= i    return totalresult = 0n = int(input("输入<=0的数字："))for i in range(0, n+1):    result += one(i)print(result)

January 23 "Basic knowledge of Python3"