How to concatenate items in a list to a single string

Question

Is there a simpler way to concatenate string items in a list into a single string   Can I use the str join   function   E g  this is the input   this   is   a   sentence   and this is the desired output this-is-a-sentence  sentence     this   is   a   sentence   sent str      for i in sentence      sent str    str i     -  sent str   sent str  -1  print sent str

User · Answer

Edit from the future  Please don t use this  this function was removed in Python 3 and Python 2 is dead  Even if you are still using Python 2 you should write Python 3 ready code to make the inevitable upgrade easier  Although  Burhan Khalid s answer is good  I think it s more understandable like this  from str import join  sentence     this   is   a   sentence    join sentence   quot - quot     The second argument to join   is optional and defaults to  quot   quot

User · Answer

This will help for sure - arr   a   b   h   i         let this be the list s  quot  quot                         creating a empty string for i in arr     s  i                     to form string without using any function print s

User · Answer

Without  join   method you can use this method  my list   quot this quot   quot is quot   quot a quot   quot sentence quot    concenated string  quot  quot  for string in range len my list        if string    len my list -1          concenated string  my list string      else          concenated string  f  my list string  -  print  concenated string        gt  gt  gt    this-is-a-sentence    So  range based for loop in this example   when the python reach the last word of your list  it should nt add  quot - quot  to your concenated string  If its not last word of your string always append  quot - quot  string to your concenated string variable

User · Answer

list     aaa    bbb    ccc    string      join list  print string   gt  gt  gt  aaabbbccc  string       join list  print string   gt  gt  gt  aaa bbb ccc  string    -  join list  print string   gt  gt  gt  aaa-bbb-ccc  string     n  join list  print string   gt  gt  gt  aaa  gt  gt  gt  bbb  gt  gt  gt  ccc

User · Answer

If you have mixed content list  And want to stringify it  Here is one way  Consider this list   gt  gt  gt  aa  None  10   hello    Convert it to string   gt  gt  gt  st        join map str  map lambda x  f  quot  x  quot   if isinstance x  str  else x  aa     gt  gt  gt  st         st        gt  gt  gt  st   None  10   quot hello quot     If required  convert back to list   gt  gt  gt  ast literal eval st   None  10   hello

User · Answer

Use join   gt  gt  gt  sentence     this    is    a    sentence    gt  gt  gt   -  join sentence   this-is-a-sentence   gt  gt  gt      join sentence   this is a sentence

User · Answer

We can specify how we have to join the string  Instead of  -   we can use      sentence     this   is   a   sentence   s      join sentence   print s

User · Answer

A more generic way to convert python lists to strings would be    gt  gt  gt  my lst    1  2  3  4  5  6  7  8  9  10   gt  gt  gt  my lst str      join map str  my lst    gt  gt  gt  print my lst str   12345678910

User · Answer

We can also use Python s reduce function   from functools import reduce  sentence     this   is   a   sentence   out str   str reduce lambda x y  x  -  y  sentence   print out str

User · Answer

If you want to generate a string of strings separated by commas in final result  you can use something like this  sentence     this   is   a   sentence   sentences strings    quot   quot     quot     quot  join sentence     quot   quot  print  sentences strings    you will get  quot  this   is   a   sentence  quot   I hope this can help someone

User · Answer

It s very useful for beginners to know  why join is a string method   It s very strange at the beginning  but very useful after this   The result of join is always a string  but the object to be joined can be of many types  generators  list  tuples  etc     join is faster because it allocates memory only once  Better than classical concatenation  see  extended explanation    Once you learn it  it s very comfortable and you can do tricks like this to add parentheses    gt  gt  gt      join  12345   join            Out    1 2 3 4 5     gt  gt  gt  list              gt  gt  gt      join  12345   join list  Out    1 2 3 4 5

User · Answer

def eggs someParameter       del spam 3      someParameter insert 3    and cats      spam     apples    bananas    tofu    cats   eggs spam  spam       join spam   print spam

[python] How to concatenate items in a list to a single string?

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