初学编程100个代码大全python

打印"Hello, World!"：

python
print("Hello, World!")

计算两个数字的和：

python
num1 = 5
num2 = 3
sum = num1 + num2
print("The sum is:", sum)

计算两个数字的乘积：

python
num1 = 5
num2 = 3
product = num1 * num2
print("The product is:", product)

判断一个数是奇数还是偶数：

python
num = 6
if num % 2 == 0:
    print(num, "is even.")
else:
    print(num, "is odd.")

判断一个年份是否是闰年：

python
year = 2024
if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
    print(year, "is a leap year.")
else:
    print(year, "is not a leap year.")

计算斐波那契数列：

python
def fibonacci(n):
    if n <= 1:
        return n
    else:
        return fibonacci(n-1) + fibonacci(n-2)

nterms = 10
if nterms <= 0:
    print("Please enter a positive integer")
else:
    print("Fibonacci sequence:")
    for i in range(nterms):
        print(fibonacci(i))

计算阶乘：

python
def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n-1)

num = 5
print("Factorial of", num, "is", factorial(num))

检查一个数字是否为素数：

python
def is_prime(num):
    if num <= 1:
        return False
    for i in range(2, int(num ** 0.5) + 1):
        if num % i == 0:
            return False
    return True

num = 17
if is_prime(num):
    print(num, "is a prime number.")
else:
    print(num, "is not a prime number.")

这些示例可以帮助你开始练习Python编程。你可以尝试编写这些代码，并根据需要进行修改和扩展。

反转字符串：

python
string = "hello"
reversed_string = string[::-1]
print("Reversed string:", reversed_string)

计算列表中的最大值和最小值：

python
numbers = [3, 7, 2, 9, 5]
print("Maximum number:", max(numbers))
print("Minimum number:", min(numbers))

求一个列表的平均值：

python
numbers = [3, 7, 2, 9, 5]
average = sum(numbers) / len(numbers)
print("Average:", average)

检查一个字符串是否是回文字符串：

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

string = "radar"
if is_palindrome(string):
    print(string, "is a palindrome.")
else:
    print(string, "is not a palindrome.")

打印九九乘法表：

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

实现冒泡排序算法：

python
def bubble_sort(arr):
    n = len(arr)
    for i in range(n-1):
        for j in range(0, n-i-1):
            if arr[j] > arr[j+1]:
                arr[j], arr[j+1] = arr[j+1], arr[j]

arr = [64, 34, 25, 12, 22, 11, 90]
bubble_sort(arr)
print("Sorted array:", arr)

实现二分查找算法：

python
def binary_search(arr, target):
    low, high = 0, len(arr) - 1
    while low <= high:
        mid = (low + high) // 2
        if arr[mid] == target:
            return mid
        elif arr[mid] < target:
            low = mid + 1
        else:
            high = mid - 1
    return -1

arr = [2, 3, 4, 10, 40]
target = 10
result = binary_search(arr, target)
if result != -1:
    print("Element is present at index", result)
else:
    print("Element is not present in array")

这些示例可以帮助你建立起对Python编程的基础，并为你提供了实践各种编程概念的机会。