Loop through list with both content and index

Question

It is very common for me to loop through a python list to get both the contents and their indexes  What I usually do is the following   S    1 30 20 30 2    My list for s  i in zip S  range len S           Do stuff with the content s and the index i   I find this syntax a bit ugly  especially the part inside the zip function  Are there any more elegant Pythonic ways of doing this

User · Accepted Answer

Use the enumerate built-in function  http   docs python org library functions html enumerate

User · Answer

Like everyone else   for i  val in enumerate data       print i  val   but also  for i  val in enumerate data  1       print i  val   In other words  you can specify as starting value for the index count generated by enumerate   which comes in handy if you don t want your index to start with the default value of zero   I was printing out lines in a file the other day and specified the starting value as 1 for enumerate    which made more sense than 0 when displaying information about a specific line to the user

User · Answer

enumerate is what you want   for i  s in enumerate S       print s  i

User · Answer

enumerate   makes this prettier   for index  value in enumerate S       print index  value   See here for more

User · Answer

gt  gt  gt  for i  s in enumerate S

User · Answer

Use enumerate      gt  gt  gt  S    1 30 20 30 2   gt  gt  gt  for index  elem in enumerate S           print index  elem    0  1   1  30   2  20   3  30   4  2

[python] Loop through list with both content and index

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