100 Python practice questions (1)

1. Write a program that takes two numbers and calculates their sum.

num1 = float(input("请输入第一个数："))
num2 = float(input("请输入第二个数："))
sum = num1 + num2
print("两个数的和为：", sum)

2. Write a program that takes a string as input and outputs that string in reverse order.

string = input("请输入一个字符串：")
reverse_string = string[::-1]
print("倒序输出字符串：", reverse_string)

3. Write a program to check whether a number is prime or not.

num = int(input("请输入一个整数："))

if num > 1:
    for i in range(2, int(num/2)+1):
        if (num % i) == 0:
            print(num, "不是质数")
            break
    else:
        print(num, "是质数")
else:
    print(num, "不是质数")

4. Write a program that calculates and outputs the first n terms of the Fibonacci sequence (n is input by the user).

n = int(input("请输入要输出的斐波那契数列的项数："))

fibonacci_list = [0, 1]

for i in range(2, n):
    fibonacci_list.append(fibonacci_list[i-1] + fibonacci_list[i-2])

print("斐波那契数列的前", n, "项为：", fibonacci_list)

5. Write a program to determine whether a string is a palindrome.

string = input("请输入一个字符串：")

if string == string[::-1]:
    print(string, "是回文串")
else:
    print(string, "不是回文串")

6. Write a program to find the largest and smallest value in a list.

num_list = [10, 5, 8, 2, 15, 3]

max_num = max(num_list)
min_num = min(num_list)

print("列表中的最大值为：", max_num)
print("列表中的最小值为：", min_num)

7. Write a program to check if a year is a leap year.

year = int(input("请输入一个年份："))

if (year % 4) == 0:
    if (year % 100) == 0:
        if (year % 400) == 0:
            print(year, "是闰年")
        else:
            print(year, "不是闰年")
    else:
        print(year, "是闰年")
else:
    print(year, "不是闰年")

8. Write a program that merges two lists into a new list.

list1 = [1, 2, 3]
list2 = [4, 5, 6]

merged_list = list1 + list2

print("合并后的列表为：", merged_list)

9. Write a program to check whether a number is a perfect square.

import math

num = int(input("请输入一个整数："))

sqrt = math.isqrt(num)

if sqrt * sqrt == num:
    print(num, "是完全平方数")
else:
    print(num, "不是完全平方数")

10. Write a program that counts the number of occurrences of each character in a string.

string = input("请输入一个字符串：")

char_count = {
    
    }

for char in string:
    char_count[char] = char_count.get(char, 0) + 1

print("每个字符出现的次数：")
for char, count in char_count.items():
    print(char, ":", count)

These are the code samples for the first 10 practice questions