How can I access each element of a pair in a pair list

Question

I have a list called pairs   pairs      a   1     b   2     c   3     And I can access elements as   for x in pairs      print x   which gives output like     a   1    b   2    c   3    But I want to access each element in each pair  like in c    if we use pair lt string  int gt  we are able to access  first element and second element by x first  and x second eg   x   make pair  a  1  x first   a  x second  1   How can I do the same in python

User · Answer

You can access the members by their index in the tuple.

lst = [(1,'on'),(2,'onn'),(3,'onnn'),(4,'onnnn'),(5,'onnnnn')]

def unFld(x):

    for i in x:
        print(i[0],' ',i[1])

print(unFld(lst))

Output :

1    on

2    onn

3    onnn

4    onnnn

5    onnnnn

User · Answer

I don t think that you ll like it but I made a pair port for python     using it is some how similar to c    pair   Pair pair make pair value1  value2    or   pair   Pair value1  value2    here s the source code pair stl for python

User · Answer

When you say pair 0   that gives you   a   1   The thing in parentheses is a tuple  which  like a list  is a type of collection  So you can access the first element of that thing by specifying  0  or  1  after its name  So all you have to do to get the first element of the first element of pair is say pair 0  0   Or if you want the second element of the third element  it s pair 2  1

User · Answer

If you want to use names  try a namedtuple   from collections import namedtuple  Pair   namedtuple  Pair     first    second     pairs    Pair  a   1   Pair  b   2   Pair  c   3    for pair in pairs      print  First       second       format pair first  pair second

User · Answer

A 2-tuple is a pair  You can access the first and second elements like this   x     a   1    make a pair x 0    access  a  x 1    access 1

User · Answer

Use tuple unpacking    gt  gt  gt  pairs      a   1     b   2     c   3    gt  gt  gt  for a  b in pairs         print a  b      a 1 b 2 c 3   See also  Tuple unpacking in for loops

[python] How can I access each element of a pair in a pair list?

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