Replace_a_string.py

# Write a Python program to replace a string "Python" with "Java" and "Java" with "Python" in a given string.
'''
Input: English letters (including single byte alphanumeric characters, blanks, symbols) are given on one line. 
The length of the input character string is 1000 or less.
Input a text with two words 'Python' and 'Java'
Output: Exchanged character string of Python and Java on one line.
'''
print("Input a text With Two Words 'Python' & 'Java'")
text = input().split()
for i in range(len(text)):
    if "Python" in text[i]:n = text[i].index("Python");text[i] = text[i][:n] + "Java" + text[i][n + 6:]
    elif "Java" in text[i]:n = text[i].index("Java");text[i] = text[i][:n] + "Python" + text[i][n + 4:]
print(*text)