Python learning: Find the first occurrence of a letter in a string

"' Find the first occurrence of a character in a string ' Def searfisrt (str): #定义一个数据字典 dic={} for I in range (len (str)): If Str[i] in dic:             Dic[str[i]]+=1 else:dic[str[i]]=1 for I in range (len (str)): If dic[str[i]]==1: Return str[i]str= ' asasc ' Print (SEARFISRT (str))

The idea of the above code:

• First, the letters in the string and the number of occurrences of the data dictionary letter as the key, the number of letters as the corresponding value

• Using the uniqueness of key and then traversing the source string, such as the letter in the source string as the key, the corresponding Vlue value is 1, the first occurrence of the non-repeating letter is found

Python learning: Find the first occurrence of a letter in a string