This ensures that only the first occurrence of the search_string is considered, and the loop doesn’t continue unnecessarily. Example 3: Get String in List Using index() MethodIn this last example, we will use
Finding the First Occurrence Imagine you have more than one instance of an element, thenindex()will give you the first position where the element appears. list_numbers=[3,1,2,3,3,4,5,6,3,7,8,9,10]element=3list_numbers.index(element) ...
This code finds the first occurrence of ‘a’ in my_list and prints its index. If there is no ‘a’ in the list, it will raise an IndexError since the list comprehension will be an empty list, and it’s trying to access the first element of it. ...
# Iterate over the files in the current "root"forfile_entryinfiles:# create the relative path to the filefile_path = os.path.join(root, file_entry)print(file_path) 我们也可以使用root + os.sep() + file_entry来实现相同的效果,但这不如我们使用的连接路径的方法那样符合 Python 的风格。使用...
Find the index of an item in a list having multiple frequencies When we have multiple frequencies of an item to be found, theindex()method returns the index of the first occurrence. # String listcities=["bangalore","chennai","mangalore","chennai","delhi"]# Item to be founditem="chennai...
red_dict={}blue_dict={}for i in red_counter.most_common():#Using counter of collections module to count the occurrence times of each number of red ball and blue ballred_dict['{}'.format(i[0])]=i[1]for j in blue_counter.most_common():blue_dict['{}'.format(j[0])]=j[1]...
for variable in sequence: # Loop operations # or for a in range(length): # Loop operations Example 2: # listl=["Gwalior","Delhi","Bhopal","Indore","Noida","Delhi","Ajmer"]# Using for loop to get the indexforiinrange(len(l)):ifl[i]=="Delhi":# if element found, then# pri...
Be aware that theindex()method only returns the index of the first occurrence of the specified element. consonants=["b","f","g","h","j","g"]i=consonants.index("g")print("The index of g is:",i) Output: The index of g is: 2 ...
from stringimportascii_letters,digits defcompare_alphanumeric(first,second):forcharacterinfirst:ifcharacterinascii_letters+digits and character notinsecond:returnFalsereturnTrue str1='ABCD'str2='ACDB'print(compare_alphanumeric(str1,str2))str1='A45BCD'str2='ACD59894B'print(compare_alphanumeric(str...
Thefind_one()method returns the first occurrence in the selection. ExampleGet your own Python Server Find the first document in the customers collection: importpymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["mydatabase"] ...