Python programs are often short and concise and what usually requires bunch of lines in other programming languages (that I know of) can be accomplished in a line or two in python. One such program I am trying to write was to extract every other letters from a string. I have this working code, but wondering if any other concise way is possible?
>>> s
'abcdefg'
>>> b = ""
>>> for i in range(len(s)):
... if (i%2)==0:
... b+=s[i]
...
>>> b
'aceg'
>>>
Here is another example both for list and string:
sentence = "The quick brown fox jumped over the lazy dog."
sentence[::2]
Here we are saying: Take the entire string from the beginning to the end and return every 2nd character.
Would return the following:
'Teqikbonfxjme vrtelz o.'
You can do the same for a list:
colors = ["red", "organge", "yellow","green", "blue"]
colors[1:4]
would retrun:
['organge', 'yellow', 'green']
The way I read the slice is: If we have sentence[1:4]
Start at index 1 (remember the starting position is index 0) and Stop BEFORE the index 4