join in Python

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*Memo for string, bytes and bytearray functions:

• My post explains split().
• My post explains rsplit().
• My post explains splitlines().
• My post explains partition().
• My post explains rpartition().

*Memo for a string, bytes and bytearray:

• My post explains a string.
• My post explains a bytes.
• My post explains a bytearray.

str.join() and bytes.join() or bytearray.join() can concatenate the zero or more characters and bytes of the string and bytes or bytearray with the zero or more characters and bytes of each string and bytes or bytearray respectively of an iterable as shown below:

*Memo:

• The 1st argument is iterable(Required-Type:Iterable(str for str.join() or Bytes-like object for bytes.join() and bytearray.join())):
  • Don't use iterable=.

<String>:

v = ['one', 'two', 'three', 'four']

print(''.join(v))
# onetwothreefour

print(' '.join(v))
# one two three four

print('  '.join(v))
# one  two  three  four

print('-'.join(v))
# one-two-three-four

print(' - '.join(v))
# one - two - three - four

print('<->'.join(v))
# one<->two<->three<->four

v = ['', '', '', '']

print(''.join(v))
print(' '.join(v))
print('  '.join(v))
# Nothing

print('-'.join(v))
# ---

print(' - '.join(v))
#  -  -  - 

print('<->'.join(v))
# <-><-><->

v = []

print('-'.join(v))
# Nothing

v = [0, 12, 345, 6789]

print(''.join(map(str, v)))
print(''.join([str(num) for num in v]))
# 0123456789

print('-'.join(map(str, v)))
print('-'.join([str(num) for num in v]))
# 0-12-345-6789

<Bytes & Bytearray>:

bytes:

v = [b'one', b'two', b'three', b'four']
v = [bytearray(b'one'), bytearray(b'two'),
     bytearray(b'three'), bytearray(b'four')]

print(b''.join(v))
# b'onetwothreefour'

print(b' '.join(v))
# b'one two three four'

print(b'  '.join(v))
# b'one  two  three  four'

print(b'-'.join(v))
# b'one-two-three-four'

print(b' - '.join(v))
# b'one - two - three - four'

print(b'<->'.join(v))
# b'one<->two<->three<->four'

v = [b'', b'', b'', b'']
v = [bytearray(b''), bytearray(b''), bytearray(b''), bytearray(b'')]

print(b''.join(v))
# b''

print(b' '.join(v))
# b'   '

print(b'  '.join(v))
# b'      '

print(b'-'.join(v))
# b'---'

print(b' - '.join(v))
# b' -  -  - '

print(b'<->'.join(v))
# b'<-><-><->'

v = []

print(b'-'.join(v))
# b''

v = [2, 4, 6]

print(b''.join(map(bytes, v)))
print(b''.join(map(bytearray, v)))
print(b''.join([bytes(num) for num in v]))
print(b''.join([bytearray(num) for num in v]))
# b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'

print(b'-'.join(map(bytes, v)))
print(b'-'.join(map(bytearray, v)))
print(b'-'.join([bytes(num) for num in v]))
print(b'-'.join([bytearray(num) for num in v]))
# b'\x00\x00-\x00\x00\x00\x00-\x00\x00\x00\x00\x00\x00'

bytearray:

v = [b'one', b'two', b'three', b'four']
v = [bytearray(b'one'), bytearray(b'two'),
     bytearray(b'three') ,bytearray(b'four')]

print(bytearray(b'').join(v))
# bytearray(b'onetwothreefour')

print(bytearray(b' ').join(v))
# bytearray(b'one two three four')

print(bytearray(b'  ').join(v))
# bytearray(b'one  two  three  four')

print(bytearray(b'-').join(v))
# bytearray(b'one-two-three-four')

print(bytearray(b' - ').join(v))
# bytearray(b'one - two - three - four')

print(bytearray(b'<->').join(v))
# bytearray(b'one<->two<->three<->four')

v = [b'', b'', b'', b'']
v = [bytearray(b''), bytearray(b''), bytearray(b''), bytearray(b'')]

print(bytearray(b'').join(v))
# bytearray(b'')

print(bytearray(b' ').join(v))
# bytearray(b'   ')

print(bytearray(b'  ').join(v))
# bytearray(b'      ')

print(bytearray(b'-').join(v))
# bytearray(b'---')

print(bytearray(b' - ').join(v))
# bytearray(b' -  -  - ')

print(bytearray(b'<->').join(v))
# bytearray(b'<-><-><->')

v = []

print(bytearray(b'-').join(v))
# bytearray(b'')

v = [2, 4, 6]

print(bytearray(b'').join(map(bytes, v)))
print(bytearray(b'').join(map(bytearray, v)))
print(bytearray(b'').join([bytes(num) for num in v]))
print(bytearray(b'').join([bytearray(num) for num in v]))
# bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')

print(bytearray(b'-').join(map(bytes, v)))
print(bytearray(b'-').join(map(bytearray, v)))
print(bytearray(b'-').join([bytes(num) for num in v]))
print(bytearray(b'-').join([bytearray(num) for num in v]))
# bytearray(b'\x00\x00-\x00\x00\x00\x00-\x00\x00\x00\x00\x00\x00')