How do I reverse words in Python?
For instance:
SomeArray=('Python is the best programming language')
i=''
for x in SomeArray:
#i dont know how to do it
print(i)
The result must be:
egaugnal gnimmargorp tseb eht si nohtyP
please help. And explain.
PS:
I can't use [::-1]. I know about this. I must do this in an interview, using only loops :)
>>> s = 'Python is the best programming language'
>>> s[::-1]
'egaugnal gnimmargorp tseb eht si nohtyP'
UPD:
if you need to do it in a loop, you can use range to go backwards:
>>> result = ""
>>> for i in xrange(len(s)-1, -1, -1):
... result += s[i]
...
>>> result
'egaugnal gnimmargorp tseb eht si nohtyP'
or, reversed():
>>> result = ""
>>> for i in reversed(s):
... result += i
...
>>> result
'egaugnal gnimmargorp tseb eht si nohtyP'
range() instead of xrange().Use the slice notation:
>>> string = "Hello world."
>>> reversed_string = string[::-1]
>>> print reversed_string
.dlrow olleH
You can read more about the slice notatoin here.
A string in Python is an array of chars, so you just have to traverse the array (string) backwards. You can easily do this like this:
"Python is the best programming language"[::-1]
This will return "egaugnal gnimmargorp tseb eht si nohtyP".
[::-1] traverses an array from end to start, one character at a time.
reversedor[::-1].