python字符串find

String.find()方法 (String.find() Method)

find() is an inbuilt method of python, it is used to check whether a sub-string exists in the string or not. If sub-string exists, the method returns the lowest index of the sub-string, if sub-string does not exist, method return -1.

find()是python的內(nèi)置方法，用于檢查字符串中是否存在子字符串。 如果存在子字符串，則該方法返回子字符串的最低索引，如果子字符串不存在，則方法返回-1。

Note: This method is case sensitive.

注意：此方法區(qū)分大小寫。

Syntax:

句法：

String.find(sub_string[, start_index[, end_index]])

Parameters:

參數(shù)：

• sub_string - a part of the string to be found in the string.

  sub_string-要在字符串中找到的字符串的一部分。

• start_index - an optional parameter, it defines the starting index from where sub_string should be found.

  start_index-可選參數(shù)，它定義從中應(yīng)找到sub_string的起始索引。

• end_index - an optional parameter, it defines end index of the string. Find method will find the sub_string till this end_index.

  end_index-可選參數(shù)，它定義字符串的結(jié)束索引。 Find方法將查找sub_string直到此end_index 。

Return value:

返回值：

• Returns the lowest index of the sub_string, if it exits in the string.

  返回 sub_string 的最低索引 ，如果它存在于字符串中。

• Returns -1 if sub_string does not exist in the string.

  如果sub_string在字符串中不存在，則返回-1 。

Example:

例：

# string in which we have to find the sub_string str = "Hello world, how are you?"# sub_string to find the given string sub_str = "how"# find by sub_str print (str.find (sub_str))# find by sub_str with slice:start index print (str.find (sub_str, 10))# find by sub_str with slice:start index and slice: end index print (str.find (sub_str, 10, 24))# find a sub_str that does not exist sub_str = "friend" # find by sub_str print (str.find (sub_str))# find a sub_str with different case sub_str = "HOW" # find by sub_str print (str.find (sub_str))

Output

輸出量

131313-1-1

翻譯自: https://www.includehelp.com/python/string-find-method-with-example.aspx

python字符串find

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