Input string elements in a tuple and replace all 'a' with 'an'.

Question

I have used the replace(). is there a different way to do the same without using the function?
https://code.sololearn.com/cnAllnqbMyzQ/?ref=app

Answer 1

Here a sample without using replace. Not as short as HonFu's solution...

res = []
for i in seq:
if i == 'a':
res.append('an')
else:
res.append(i)
print(''.join(res))

Answer 2

see some comments from me and also a reworked code:

'''
seq= eval(input('enter elements \t')) # eval does not allow to evaluate strings, and should generally not be used because of security issues
seq1= list(seq) # not necessary if you use replace()
for index, item in enumerate(seq1): # not necessary to use loop
if 'a' in item: #not necessary if you use replace()
seq1[index] = item.replace('a','an') # use modified code here
seq = tuple(seq1) # you don't need to a tuple
print(seq)
# -> the output is a bit weird...
'''

# keep in mind, that both codes replace all *a*, wherever they appear
# so the reworked code could be:

seq = input('enter elements \t') # <-----------
print(seq.replace('a','an'))

Answer 3

Azmat, you are using the *eval* function for input. This is very convenient in some cases. But eval also has a downside, as anything that will be input is executed. This can be a few numbers, but could also be some code that is malicious.
So it's better to get around this, even if it's a bit more of coding.

You can find here a really good article about using eval:
https://stackoverflow.com/questions/1832940/why-is-using-eval-a-bad-practice

Answer 4

print(*('an' if e=='a' else e for e in seq1))

Or in one line:

print(*('an' if e=='a' else e for e in input().split()))

(input like this: this is a line of input)

Answer 5

Also see here:

https://nedbatchelder.com/blog/201206/eval_really_is_dangerous.html

Answer 6

HonFu Mirielle🐶 [Inactive] thank you.

Answer 7

HonFu Lothar thanks I understand now.

Answer 8

Lothar I really can't wrap my head around why usage of 'eval' is discouraged can you explain it a bit? Thanks