在 Python 中获取从索引到字符串末尾的子字符串

在 Python 中获取从索引到字符串末尾的子字符串

Get substring from index to end of string in Python

使用字符串切片获取从索引到字符串末尾的子字符串，例如result = my_str[index:]. 如果stop未指定索引值，则切片会转到字符串的末尾。

my_str = 'bobbyhadz'

# 👇️ get index of first occurrence of character
index = my_str.index('h')

result = my_str[index:]
print(result)  # 👉️ 'hadz'

# ------------------------------------

# 👇️ get index of last occurrence of character

last_index = my_str.rindex('b')
print(my_str[last_index:])  # 👉️ 'byhadz'

我们使用字符串切片来获取从索引到字符串末尾的子字符串。

字符串切片的语法是my_str[start:stop:step].

Python 索引是从零开始的，因此字符串中的第一个字符的索引为0，最后一个字符的索引为-1or len(my_str) - 1。

我们可以通过省略stop索引来获取到字符串末尾的切片。

my_str = 'bobbyhadz'

index = my_str.index('h')

result = my_str[index:]
print(result)  # 👉️ 'hadz'

索引的值stop是独占的（最多但不包括），因此如果您指定索引-1，字符串中的最后一个字符将不会包含在切片中。

my_str = 'bobbyhadz'

index = my_str.index('h')

result = my_str[index:-1]
print(result)  # 👉️ 'had'

切片上升到但不包括字符串中的最后一个字符。

str.index
方法返回字符串中提供的子字符串第一次出现的索引。

You can use a try/except block to handle the scenario where the substring is
not found in the string.

my_str = 'bobbyhadz'

try:
    index = my_str.index('X')
    result = my_str[index:]
    print(result)
except ValueError:
    # 👇️ this runs
    print('The substring is not contained in the string')

The except block handles the ValueError if the substring is not contained in
the string.

The str.index() method returns the index of the first occurrence of the given
substring in the string.

If you need to get the index of the last occurrence, use the str.rindex()
method.

my_str = 'bobbyhadz'

last_index = my_str.rindex('b')
print(my_str[last_index:])  # 👉️ 'byhadz'

The str.rindex
method returns the highest index in the string where the provided substring is
found.

The rindex() method also raises a ValueError if the substring is not
contained in the string.