39 lines
825 B
Python
39 lines
825 B
Python
# 输出所有 1~100 中的偶数
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for i in range(1, 101):
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if i % 2 == 0:
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print(i)
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# 判断 100 以内有多少个质数（素数）
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for num in range(2, 101):
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is_prime = True
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for i in range(2, int(num ** 0.5) + 1):
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if num % i == 0:
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is_prime = False
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break
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if is_prime:
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print(num)
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# 打印斐波那契数列前 20 个数
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a, b = 0, 1
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for _ in range(20):
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print(a, end=' ')
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a, b = b, a + b
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# 九九乘法表横着显示
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for i in range(1, 10):
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for j in range(1, 10):
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print(f"{i}*{j}={i*j:2}", end=" ")
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print()
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# 用户输入一个字符串，统计每个字母出现的次数（用 for + 字典）
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s = input("请输入一段文字：")
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count = {}
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for ch in s:
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if ch.isalpha():
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count[ch] = count.get(ch, 0) + 1
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print(count)
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