python小练习题（python练习题）

1、猜数字游戏

由某人随机出一个指定范围内的数，然后其他人一个一个猜，猜的过程中区间不断缩小，直到猜中为止。

import random

i = int(input("random start:"))
j = int(input("random end:")) 
rand = random.randrange(i,j)     # 生成区间内的随机数
print('Random number in [' + str(i) + ',' + str(j) + '] generated!')
num = int(input("Please guess the number:"))
count = 0
while(num != rand):
    count += 1
    if (num < rand):
        print('Lower than the answer')
    else:
        print('Higher than the answer')
    num = int(input('Guess the number again:'))

print(' You get the answer with [%d] times' % count)

2、有四个数字1、2、3、4，能组成多少个互不相同且数字不重复的三位数。

count = 1
lst = []
for i in range(1,5):
    for j in range(1,5):
        for k in range(1,5):
            if (i != k) and (i != j) and (j != k):
                lst.append(i*100+j*10+k)
                count += 1
print(count)
print(lst)

3、从键盘输入一个字符串，将小写字母全部转换成大写字母，输出到磁盘文件“test”中进行保存。

in_put = input('Please input string：')
new_str = in_put.upper()
with open('test.txt','w') as f:
    f.write(new_str)

with open('test.txt','r') as f:
    f_str = f.read()
    print(f_str)

# >Please input string：ssssAAAKKKssss
# >SSSSAAAKKKSSSS

4、输入3个数，按照从小到大输出

x = int(input('Please input:'))
y = int(input('Please input:'))
z = int(input('Please input:'))

l = [x,y,z]
new_list = sorted(l)
print(new_list) 

# >Please input:22
# >Please input:43
# >Please input:55
# >[22, 43, 55]

5、有一分数序列：2/1，3/2，5/3，8/5，13/8，21/13...求出这个数列的前20项之和

a = 2
b = 1

count = 0
sum_num = 0

while count != 20:
    count += 1
    sum_num += a/b
    t = a+b  # 3    # 5
    b = a    # 2    # 3
    a = t    # 3

print(sum_num)  # 32.66026079864164

a = 2
b = 1
sum_num = 0

for i in range(20):
    sum_num += a/b
    t = a+b  # 3    # 5
    b = a    # 2    # 3
    a = t    # 3

print(sum_num)  # 32.66026079864164