Python string join list on object array rather than string array

Question

In Python  I can do    gt  gt  gt  list     a    b    c    gt  gt  gt       join list   a  b  c    Is there any easy way to do the same when I have a list of objects    gt  gt  gt  class Obj          def   str   self               return  name       gt  gt  gt  list    Obj    Obj    Obj     gt  gt  gt       join list  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  TypeError  sequence item 0  expected string  instance found   Or do I have to resort to a for loop

User · Accepted Answer

You could use a list comprehension or a generator expression instead        join  str x  for x in list      list comprehension      join str x  for x in list       generator expression

User · Answer

I know this is a super old post  but I think what is missed is overriding   repr    so that   repr       str    which is the accepted answer of this question marked duplicate

User · Answer

The built-in string constructor will automatically call obj   str        join map str list

User · Answer

I know this is a super old post  but I think what is missed is overriding   repr    so that   repr       str    which is the accepted answer of this question marked duplicate

User · Answer

another solution is to override the join operator of the str class    Let us define a new class my string as follows   class my string str       def join self  l           l tmp    str x  for x in l          return super my string  self  join l tmp    Then you can do  class Obj      def   str   self           return  name   list    Obj    Obj    Obj    comma   my string       print comma join list    and you get  name name name   BTW  by using list as variable name you are redefining the list class  keyword    Preferably use another identifier name   Hope you ll find my answer useful

User · Answer

another solution is to override the join operator of the str class    Let us define a new class my string as follows   class my string str       def join self  l           l tmp    str x  for x in l          return super my string  self  join l tmp    Then you can do  class Obj      def   str   self           return  name   list    Obj    Obj    Obj    comma   my string       print comma join list    and you get  name name name   BTW  by using list as variable name you are redefining the list class  keyword    Preferably use another identifier name   Hope you ll find my answer useful

User · Answer

The built-in string constructor will automatically call obj   str        join map str list

User · Answer

The built-in string constructor will automatically call obj   str        join map str list

User · Answer

The built-in string constructor will automatically call obj   str        join map str list

[python] Python string.join(list) on object array rather than string array

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