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String 字符串

可以通过下标索引获取字符串的某一位字符

Python
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a = "Hello"

print(a[0])
a = "Hello"

print(a[0])        
      

分片操作

string[left:right:step]

step表示每次间隔多少个元素

Python
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a = "Hello"

# a[left:right:step]
print(a[0::2])

# 倒叙输出
print(a[::-1])
a = "Hello"

# a[left:right:step]
print(a[0::2])

# 倒叙输出
print(a[::-1])
        
      

字符串拼接

Python
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a = "hello" + " world"
print(a)   # 直接使用加号

a = "hello"
a = "hello" + " world"
print(a)   # 直接使用加号

a = "hello"
        
      