What exactly does the join method do

Question

I m pretty new to Python and am completely confused by  join   which I have read is the preferred method for concatenating strings   I tried   strid   repr 595  print array array  c   random sample string ascii letters  20 - len strid         tostring   join strid    and got something like   5wlfgALGbXOahekxSs9wlfgALGbXOahekxSs5   Why does it work like this   Shouldn t the 595 just be automatically appended

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To append a string  just concatenate it with the   sign   E g    gt  gt  gt  a    Hello     gt  gt  gt  b    world   gt  gt  gt  str   a   b  gt  gt  gt  print str Hello  world   join connects strings together with a separator  The separator is what you place right before the join  E g    gt  gt  gt   -  join  a b    Hello  -world    Join takes a list of strings as a parameter

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On providing this as input    li     server mpilgrim    uid sa    database master    pwd secret   s       join li  print s    Python returns this as output     server mpilgrim uid sa database master pwd secret

User · Answer

To expand a bit more on what others are saying  if you wanted to use join to simply concatenate your two strings  you would do this   strid   repr 595  print    join  array array  c   random sample string ascii letters  20 - len strid         tostring    strid

User · Answer

Look carefully at your output   5wlfgALGbXOahekxSs9wlfgALGbXOahekxSs5                                         I ve highlighted the  5    9    5  of your original string  The Python join   method is a string method  and takes a list of things to join with the string  A simpler example might help explain    gt  gt  gt      join   a    b    c     a b c    The     is inserted between each element of the given list  In your case  your  list  is the string representation  595   which is treated as the list   5    9    5     It appears that you re looking for   instead   print array array  c   random sample string ascii letters  20 - len strid     tostring     strid

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join may be used to copy the string in a list to a variable   gt  gt  gt  myList   list  Hello World    gt  gt  gt  myString      join myList   gt  gt  gt  print myList    H    e    l    l    o         W    o    r    l    d    gt  gt  gt  print myString  Hello World

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There is a good explanation of why it is costly to use   for concatenating a large number of strings here     Plus operator is perfectly fine solution to concatenate two Python   strings  But if you keep adding more than two strings  n   25    you   might want to think something else          join  a  b  c   trick is a performance optimization

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join   is for concatenating all list elements  For concatenating just two strings     would make more sense   strid   repr 595  print array array  c   random sample string ascii letters  20 - len strid         tostring     strid

User · Answer

join takes an iterable thing as an argument   Usually it s a list   The problem in your case is that a string is itself iterable  giving out each character in turn  Your code breaks down to this    wlfgALGbXOahekxSs  join  595     which acts the same as this    wlfgALGbXOahekxSs  join   5    9    5      and so produces your string    5wlfgALGbXOahekxSs9wlfgALGbXOahekxSs5    Strings as iterables is one of the most confusing beginning issues with Python

User · Answer

list     my    name    is    kourosh          join list    If this is an input  using the JOIN method  we can add the distance between the words and also convert the list to the string   This is Python output    my name is kourosh

[python] What exactly does the .join() method do?

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