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?
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.
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'
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'
"".join may be used to copy the string in a list to a variable
>>> myList = list("Hello World")
>>> myString = "".join(myList)
>>> print(myList)
['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd']
>>> print(myString)
Hello World