## DEV Community

HHMathewChan

Posted on • Updated on

# Python daily exercise 2: string

## Question:

• Write a program to create a new string made of an input string’s first, middle, and last character.
• Given
``````str1 = "James"
``````
• expected output
``````Jms
``````

## Solution

### My initial solution(Fail)

``````str1 = "James"
length_of_name = len(str1)
print(str1[0]+str1[length_of_name/2]+str1[-1])
``````

### Recommend solution

``````str1 = 'James'
print("Original String is", str1)

# Get first character
res = str1[0]

# Get string size
l = len(str1)
# Get middle index number
mi = int(l / 2)
# Get middle character and add it to result
res = res + str1[mi]

# Get last character and add it to result
res = res + str1[l - 1]

print("New String:", res)

``````

## Reflection

• This time I haven't figure out the correct solution
• It just keep showing TypeError: string indices must be integers
• I have also try the string with even number
• After seeing the recommend solution, I just realise the type of "length_of_name/2" is not default to integers, it doesn't matter the length_of_name is even number or not
• and confirm by using type() as follow
``````str1 = "Jamees"
length_of_name = len(str1)
half = length_of_name/2
print(length_of_name)
print(f"half = {half}")
print(f"the type of half is {type(half)}")
#print(str1[0]+str1[half]+str1[-1])
``````

### So, what to learn is

After the / operator, even the outcome is an integer in maths, its type is a float, must be changed to int for index

exercise from PYnative

jmagave

Using integer division operator `//` instead of `/`

``````s = "James"
print(s[0]+s[len(s) // 2]+s[-1:] if  len(s) > 2 else "Too small")
``````

Caveat emptor, do not handle

HHMathewChan

your solution looks much better, good to learn from this