69 lines
1.2 KiB
Python
69 lines
1.2 KiB
Python
# 1. 计算平方
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def square(n):
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return n * n
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print(square(5)) # 输出 25
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# 2. 计算两数之和
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def add(a, b):
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return a + b
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print(add(3, 7)) # 输出 10
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# 3. 判断偶数
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def is_even(n):
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return n % 2 == 0
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print(is_even(4)) # 输出 True
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print(is_even(7)) # 输出 False
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# 4. 计算列表中的最大值
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def find_max(lst):
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return max(lst)
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print(find_max([3, 5, 1, 9, 2])) # 输出 9
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# 5. 计算字符串长度
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def string_length(s):
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return len(s)
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print(string_length("hello")) # 输出 5
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# 6. 计算列表中所有元素的和
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def list_sum(lst):
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return sum(lst)
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print(list_sum([1, 2, 3, 4, 5])) # 输出 15
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# 7. 计算阶乘
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# 编写一个函数 factorial(n)，返回 n!（n 的阶乘）。
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def factorial(n):
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result = 1
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for i in range(1, n + 1):
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result *= i
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return result
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print(factorial(5)) # 输出 120
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# 8. 反转字符串
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def reverse_string(s):
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return s[::-1]
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print(reverse_string("hello")) # 输出 "olleh"
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# 9. 统计列表中某个元素的出现次数
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def count_occurrences(lst, target):
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return lst.count(target)
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print(count_occurrences([1, 2, 3, 4, 2, 2, 5], 2)) # 输出 3
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# 10. 交换两个变量
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def swap(a, b):
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return b, a
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x, y = swap(3, 7)
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print(x, y) # 输出 7 3
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