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I have a list of websites in a string and I was doing a for loop to add "http" in the front if the first index is not "h" but when I return it, the list did not change.
n is my list of websites h is "http"
for p in n:
if p[0]!="h":
p= h+ p
else:
continue
return n
when i return the list, it returns my original list and with no appending of the "http". Can somebody help me?
691
The easiest way of concatenating strings is to use the + or the += operator. The + operator is used both for adding numbers and strings; in programming we say that the operator is overloaded. Two strings are added using the + operator.
Using join() method to concatenate items in a list to a single string. The join() is an inbuilt string function in Python used to join elements of the sequence separated by a string separator. This function joins elements of a sequence and makes it a string.
Use list. insert() to add an element to the front of a list. Call a_list. insert(index, object) on a_list with 0 as index to insert object at the front of a_list .
extend to extend the list by multiple values from any kind of iterable, being it another list or any other thing that provides a sequence of values. So you can use list. append() to append a single value, and list. extend() to append multiple values.
This could also be done using list comprehension:
n = [i if i.startswith('h') else 'http' + i for i in n]
You need to reassign the list item -- strings are immutable, so += is making a new string, not mutating the old one. I.e.:
for i, p in enumerate(n):
if not p.startswith('h'):
n[i] = 'http' + p
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