Join a list of items with different types as string in Python

Question

I need to join a list of items   Many  of the items in the list are integer values returned  from a function   i e    myList append munfunc       How should I convert the returned result to a string in order to join it with the list   Do I need to do the following for every integer value   myList append str myfunc       Is there a more Pythonic way to solve casting problems

User · Answer

Your problem is rather clear  Perhaps you re looking for extend  to add all elements of another list to an existing list    gt  gt  gt  x    1 2   gt  gt  gt  x extend  3 4 5    gt  gt  gt  x  1  2  3  4  5    If you want to convert integers to strings  use str   or string interpolation  possibly combined with a list comprehension  i e    gt  gt  gt  x     1    2    gt  gt  gt  x extend  str i  for i in range 3  6     gt  gt  gt  x   1    2    3    4    5     All of this is considered pythonic  ok  a generator expression is even more pythonic but let s stay simple and on topic

User · Answer

There are three ways of doing this  let say you have a list of integers my list    100 200 300     quot - quot  join str n  for n in my list   quot - quot  join  str n  for n in my list    quot - quot  join map str  my list    However as stated in the example of timeit on python website at https   docs python org 2 library timeit html using a map is faster  So I would recommend you using  quot - quot  join map str  my list

User · Answer

There s nothing wrong with passing integers to str  One reason you might not do this is that myList is really supposed to be a list of integers e g  it would be reasonable to sum the values in the list  In that case  do not pass your ints to str before appending them to myList  If you end up not converting to strings before appending  you can construct one big string by doing something like       join map str  myList

User · Answer

map function in python can be used  It takes two arguments  First argument is the function which has to be used for each element of the list  Second argument is the iterable   a    1  2  3     map str  a      1    2    3     After converting the list into string you can use simple join function to combine list into a single string  a   map str  a         join a         123

User · Answer

For example   lst points     313  262  470  482    551  254  697  449    lst s points        join map str  lst   for lst in lst points  print lst s points     313 262 470 482    551 254 697 449     As to me  I want to add a str before each str list     here o means class  other four points means coordinate print   0         join map str  lst   for lst in lst points      0 313 262 470 482    0 551 254 697 449     Or single list   lst    313  262  470  482  lst str    str i  for i in lst  print lst str       join lst str      313    262    470    482    313  262  470  482  lst str   map str  lst  print lst str       join lst str      313    262    470    482    313  262  470  482

User · Answer

a  1 2 3  b  str x  for x in a  print b   above method is the easiest and most general way to convert list into string  another short method is-  a  1 2 3  b map str a  print b

User · Answer

Maybe you do not need numbers as strings  just do   functaulu    munfunc arg  for arg in range loppu     Later if you need it as string you can do it with string or with format string   print  Vastaus5    s    functaulu 5

User · Answer

Calling str      is the Pythonic way to convert something to a string   You might want to consider why you want a list of strings  You could instead keep it as a list of integers and only convert the integers to strings when you need to display them  For example  if you have a list of integers then you can convert them one by one in a for-loop and join them with     print     join str x  for x in list of ints

User · Answer

How come no-one seems to like repr      python 3 7 2    gt  gt  gt  int list    1  2  3  4  5   gt  gt  gt  print repr int list    1  2  3  4  5   gt  gt  gt     Take care though  it s an explicit representation  An example shows    Print repr object  backwards  gt  gt  gt  print repr int list    -1    5  4  3  2  1   gt  gt  gt     more info at pydocs-repr

[python] Join a list of items with different types as string in Python

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