71 lines
1.6 KiB
Python
71 lines
1.6 KiB
Python
# 创建字符串
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greeting = "Hello, World!"
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print(greeting)
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# 示例代码
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text = "Hello, World!"
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# 字符串长度
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length = len(text)
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print(length) # 输出：13
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# 字符串拼接
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concatenated = text + " Welcome!"
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print(concatenated) # 输出：Hello, World! Welcome!
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# 字符串复制
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repeated = text * 3
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print(repeated) # 输出：Hello, World!Hello, World!Hello, World!
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# 字符串索引
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first_char = text[0]
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print(first_char) # 输出：H
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# 字符串切片
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substring = text[7:12]
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print(substring) # 输出：World
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# 大小写转换
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lowercase = text.lower()
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uppercase = text.upper()
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print(lowercase) # 输出：hello, world!
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print(uppercase) # 输出：HELLO, WORLD!
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# 字符串查找
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position = text.find("World")
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print(position) # 输出：7
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# 字符串替换
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replaced = text.replace("World", "Python")
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print(replaced) # 输出：Hello, Python!
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# 去除空白
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trimmed = " Hello, World! ".strip()
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print(trimmed) # 输出：Hello, World!
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# 分割字符串
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words = text.split(", ")
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print(words) # 输出：['Hello', 'World!']
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"""
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基础：编写一个Python程序，将字符串 “Python” 转换为全大写并打印出来。
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"""
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str_1 = "Python"
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new_str_1 = str_1.upper()
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print(new_str_1)
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"""
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应用：给定字符串 “Hello, Python!”，使用字符串查找方法找出 “Python” 在该字符串中的位置。
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"""
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str_2 = "Hello, Python!"
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index = str_2.find("Python")
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print(index)
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"""
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挑战：编写一个Python程序，将字符串 “Hello, World!” 中的 “World” 替换为 “Python”，并将结果打印出来。
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"""
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str_3 = "Hello, World!"
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new_str_3 = str_3.replace("World", "Python")
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print(new_str_3)
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