Python enumeration--built-in function-enumerate ()

Enumeration of Python

Built-in function enumearate ()

• Enumerate () is a python built-in function
• Enumerate are enumerated and enumerated in the dictionary.
• For an iterative (iterable)/Ergodic object (such as a list, string), enumerate makes it an index sequence that can be used to obtain both the index and the value
• Enumerate multiple for counting in a for loop

Enumerate () use

• If you want to traverse the index and iterate through the elements on a list, you can first write this:

List=["This", "yes", "one", "Test"]for I in range (len (list)):    print (I,list[i])

　　

• The above method is somewhat cumbersome, and the use of enumerate () will be more direct and graceful:

List=["This", "yes", "one", "Test"]for index,iterm in Enumerate (list):    print (index,iterm)

　　

• Enumerate can also receive a second parameter that specifies the index starting value, such as:

List=["This", "yes", "one", "Test"]for index,iterm in Enumerate (list,1):    print (index,iterm)

　　

Add

If you want to count the number of lines in a file, you can write:

‘r‘).readlines())

• 1

This method is simple, but may be slow, and cannot even work when the file is larger.

You can use enumerate ():

0for index, line in enumerate(open(filepath,‘r‘))：     count += 1

Python enumeration--built-in function-enumerate ()