Stringbuilder python

# StringIO can be used to read/write strings from/to memory buffer. 

# import StringIO
try:
    from StringIO import StringIO # for Python 2
except ImportError:
    from io import StringIO # for Python 3

mylist = ['abcd' for i in range(5)]  # myList = [abcdabcdabcdabcdabcd]
file_str = StringIO()  		     # create StringIO object
for i in range(len(mylist)):
    file_str.write(mylist[i])	     # write data to StringIO object
print(file_str.getvalue())	     # abcdabcdabcdabcdabcd

"""
Alternatively, we can rely on the StringIO module
to create a class having same capabilities as
StringBuilder of other languages.
"""
class StringBuilder:
     _file_str = None

     def __init__(self):
         self._file_str = StringIO()

     def Append(self, str):
         self._file_str.write(str)

     def __str__(self):
         return self._file_str.getvalue()

sb = StringBuilder()

sb.Append("Hello ")
sb.Append("World")

print(sb)  # Hello World

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