Code:

s1 = " Welcome "
s2 = " welcome "

# (a)
# Check whether s1 is equal to s2 and assign the result to a Boolean variable
isEqual = s1 == s2
# Output: False
print(isEqual)  

# (b)
# Check whether s1 is equal to s2, ignoring case, and assign the result to a Boolean variable isEqual.
isEqual = s1.lower() == s2.lower()
# Output: True
print(isEqual)  

# (c)
# (c) Check whether s1 has the prefix AAA and assign the result to a Boolean variable b.
b = s1.startswith("AAA")
# Output: False
print(b)  

# (d)
# Check whether s1 has the suffix AAA and assign the result to a Boolean variable b.
b = s1.endswith("AAA")
# Output: False
print(b)  

# (e)
# Assign the length of s1 to a variable x.
x = len(s1)
# Output: 9
print(x)  

# (f)
# Assign the first character of s1 to a variable x.
x = s1[0]
# Output: ' '
print(x)  

# (g) 
# Create a new string s3 that combines s1 with s2.
s3 = s1 + s2
# Output: " Welcome  welcome "
print(s3)  

# (h)
# Create a substring of s1 starting from index 1.
sub1 = s1[1:]
# Output: "Welcome "
print(sub1)  

# (i)
# Create a substring of s1 from index 1 to index 4.
sub2 = s1[1:5]
# Output: "Welc"
print(sub2)  

# (j) 
# Create a new string s3 that converts s1 to lowercase.
s3 = s1.lower()
# Output: " welcome "
print(s3)  

# (k) 
# Create a new string s3 that converts s1 to uppercase.
s3 = s1.upper()
# Output: " WELCOME "
print(s3)  

# (l) 
# Create a new string s3 that trims whitespace characters on both ends of s1.
s3 = s1.strip()
# Output: "Welcome"
print(s3)  

# (m) 
# Replace e with E in s1.
s3 = s1.replace('e', 'E')
# Output: " WElcomE "
print(s3)  

# (n)
# Assign the index of the first occurrence of character e in s1 to a variable x.
x = s1.index('e')
# Output: 3
print(x)  

# (o) 
# Assign the index of the last occurrence of string abc in s1 to a variable x.
x = s1.rfind('abc')
# Output: -1
print(x)  

Output:

False
True
False
False
9
 
 Welcome  welcome 
Welcome 
Welc
 welcome 
 WELCOME 
Welcome
 WElcomE 
2
-1