Get position in list Solved

Question

Hello,

I would like to know how to get the position of an element in a list with Python?

For example, if I have a list ['lundi', 'mardi', 'mercredi'], I would like to ask it: give me the position of mardi in the list (and logically, it should return 1).
How can I code this?

Thank you in advance.

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Thorolf · Accepted Answer

liste = ['Monday','Tuesday','Wednesday']  liste.index('Tuesday') >>> 1  attention => causes an error if the element is not present in the list

dija · Answer

I think this is how it should work:

daysOfWeek = ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday']

daysOfWeek[0] returns Monday
daysOfWeek[3] returns Thursday
....
There you go!

lipton · Answer

You can do:

joursemaine.index('mardi')

which will return 1
(see http://diveintopython.adrahon.org/native_data_types/lists.html#d0e6152)
which is the most elegant version.

Generally speaking, you can always use brute force methods. If you were to iterate through a list with multiple occurrences of the same element, this method will only give you the first one, and you should consider using the enumerate() method while iterating through the list to retrieve both the element and the index.

for index,jour in enumerate(joursemaine): print index,jour

(see https://docs.python.org/3/tutorial/datastructures.html#looping-techniques)

PèreFouras · Answer

Or we can simply do this:  for index, day in enumerate(list): print "the index ", index, " corresponds to the day ", day

Viirtual · Answer

```python
s=['lundi','mardi','mercredi','jeudi','vendredi','samedi','dimanche'] for i in range(0,len(s)):  if s[i]=='mardi':  print(i)
```

Get position in list

5 réponses

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