Convert list to tuple in Python

Question

I m trying to convert a list to a tuple  Most solutions on Google offer the following code  l    4 5 6  tuple l   However  the code results in an error message when I run it   TypeError   tuple  object is not callable  How can I fix this problem

User · Answer

I find many answers up to date and properly answered but will add something new to stack of answers.

In python there are infinite ways to do this, here are some instances
Normal way

>>> l= [1,2,"stackoverflow","python"]
>>> l
[1, 2, 'stackoverflow', 'python']
>>> tup = tuple(l)
>>> type(tup)
<type 'tuple'>
>>> tup
(1, 2, 'stackoverflow', 'python')

smart way

>>>tuple(item for item in l)
(1, 2, 'stackoverflow', 'python')

Remember tuple is immutable ,used for storing something valuable. For example password,key or hashes are stored in tuples or dictionaries. If knife is needed why to use sword to cut apples. Use it wisely, it will also make your program efficient.

User · Answer

You might have done something like this    gt  gt  gt  tuple   45  34    You used  tuple  as a variable here  gt  gt  gt  tuple  45  34   gt  gt  gt  l    4  5  6   gt  gt  gt  tuple l      Will try to invoke the variable  tuple  rather than tuple type   Traceback  most recent call last     File   lt pyshell 10 gt    line 1  in  lt module gt      tuple l  TypeError   tuple  object is not callable  gt  gt  gt   gt  gt  gt  del tuple    You can delete the object tuple created earlier to make it work  gt  gt  gt  tuple l   4  5  6    Here s the problem    Since you have used a tuple variable to hold a tuple  45  34  earlier    So  now tuple is an object of type tuple now     It is no more a type and hence  it is no more Callable   Never use any built-in types as your variable name    You do have any other name to use  Use any arbitrary name for your variable instead

User · Answer

To add another alternative to tuple l   as of Python    3 5 you can do    t    l     or t     l      short  a bit faster but probably suffers from readability    This essentially unpacks the list l inside a tuple literal which is created due to the presence of the single comma       P s  The error you are receiving is due to masking of the name tuple i e you assigned to the name tuple somewhere e g tuple    1  2  3    Using del tuple you should be good to go

User · Answer

Expanding on eumiro s comment  normally tuple l  will convert a list l into a tuple   In  1   l    4 5 6   In  2   tuple Out 2    lt type  tuple  gt   In  3   tuple l  Out 3    4  5  6    However  if you ve redefined tuple to be a tuple rather than the type tuple   In  4   tuple   tuple l   In  5   tuple Out 5    4  5  6    then you get a TypeError since the tuple itself is not callable   In  6   tuple l  TypeError   tuple  object is not callable   You can recover the original definition for tuple by quitting and restarting your interpreter  or  thanks to  glglgl    In  6   del tuple  In  7   tuple Out 7    lt type  tuple  gt

User · Answer

l1         Empty list is given  l1   tuple l1     Through the type casting method we can convert list into tuple  print type l1      Now this show class of tuple

User · Answer

It should work fine  Don t use tuple  list or other special names as a variable name  It s probably what s causing your problem   gt  gt  gt  l    4 5 6   gt  gt  gt  tuple l   4  5  6    gt  gt  gt  tuple    whoops      Don t do this  gt  gt  gt  tuple l  TypeError   tuple  object is not callable

[python] Convert list to tuple in Python

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