Python – Remove index ranges from String

Given a string and ranges list, remove all the characters that occur in ranges. 

Input : test_str = ‘geeksforgeeks is best for geeks’, range_list = [(3, 6), (7, 10)]
Output : geeks is best for geeks
Explanation : The required ranges removed.

Input : test_str = ‘geeksforgeeks is best for geeks’, range_list = [(3, 6)]
Output : georgeeks is best for geeks
Explanation : The required ranges removed.

Method #1 : Using loop

In this, we check for each range, remake string, considering the index doesn’t lie in range checking using conditional statements.

Python3

# Python3 code to demonstrate working of
# Remove index ranges from String
# Using loop

# initializing strings
test_str1 = 'geeksforgeeks is best for geeks'

# printing original string
print("The original string 1 is : " + str(test_str1))

# initializing ranges list
range_list = [(3, 6), (7, 10), (14, 17)]

res = ""

for idx, chr in enumerate(test_str1):
  for strt_idx, end_idx in range_list:

    # checking for ranges and appending
    if strt_idx <= idx + 1 <= end_idx:
      break
  else:
    res += chr

# printing result
print("The reconstructed string : " + str(res))

Output

The original string 1 is : geeksforgeeks is best for geeks
The reconstructed string : geeksbest for geeks

Method #2 : Using any() + list comprehension + join()

In this, we perform task of checking for indices for strings using any() and list comprehension is used to reconstruct string accordingly. 

Python3

# Python3 code to demonstrate working of
# Remove index ranges from String
# Using any() + list comprehension + join()

# initializing strings
test_str1 = 'geeksforgeeks is best for geeks'

# printing original string
print("The original string 1 is : " + str(test_str1))

# initializing ranges list
range_list = [(3, 6), (7, 10), (14, 17)]

# using any() to check for strings in index ranges
res = ''.join(chr for idx, chr in enumerate(test_str1, 1) if not any(strt_idx <= idx <= end_idx
         for strt_idx, end_idx in range_list))

# printing result
print("The reconstructed string : " + str(res))

Output

The original string 1 is : geeksforgeeks is best for geeks
The reconstructed string : geeksbest for geeks