The i+=1 isn't working, it should have increased the i value but it isn't.
n = int(input())
for j in range(n):
a = input()
pair = 0
for i in range(len(a)-1):
print(i)
if a[i] == "x" and a[i+1] == "y":
pair += 1
print("*")
elif a[i] == "y" and a[i+1] =="x":
pair += 1
print('**')
else:
continue
i+=1
print(pair)
print("****")
print(pair)
You are trying to modify a parameter that is implicitly set by the for loop. This isn't C-Code, increasing the counter variable will not skip the next iteration.
The reason for that is quite simple: for itself does not increase i in every iteration, it just steps through the given iteratable. In this case the iteratable is a range, which behaves like for would increase i every iteration, but it really just takes the next value from the range.
So i+=1 doesn't have an effect on the next iteration, as it doesn't modify the next value in the range.
Your for-loop already increments i on every iteration. But if you want to increment by more than 1 when certain condition is satisfied, then you can use while loop as follows:
n = int(input())
for j in range(n):
a = input()
pair = 0
i = 0
while i < len(a)-1:
print(i)
if a[i] == "x" and a[i+1] == "y":
pair += 1
print("*")
elif a[i] == "y" and a[i+1] =="x":
pair += 1
print('**')
else:
i += 1
continue
i+=2
print(pair)
print("****")
print(pair)strong text
i += 1 on every continue, which is very error prone imo. I'd suggest wrapping the i += 1 with a try: finally.
continue just says move on to the next iteration, which starts with checking if i < len(a) - 1. This upper bound makes sure that i and i+1 are valid indices of a,You could explicitely skip the next iteration when a pair is found.
Here is your code with the changes pointed at by # <---.
n = int(input())
for j in range(n):
a = input()
pair = 0
skip_next = False # <---
for i in range(len(a)-1):
if skip_next is True: # <---
skip_next = False # <---
continue # <---
print(i)
if a[i] == "x" and a[i+1] == "y":
pair += 1
print("*")
skip_next = True # <---
elif a[i] == "y" and a[i+1] =="x":
pair += 1
print('**')
skip_next = True # <---
else:
continue
print(pair)
print("****")
print(pair)
