Python Coding Interview Questions (100+ Problems)

Coding interviews require strong problem-solving skills and a deep understanding of programming concepts. Python is widely used due to its simplicity and power.

This guide provides 100+ Python coding interview questions categorized from basic to advanced levels.

1. Basic Coding Questions

Q1. Swap two numbers

a, b = 5, 10
a, b = b, a
print(a, b)

Q2. Check even or odd

n = int(input())
print("Even" if n % 2 == 0 else "Odd")

Q3. Find factorial

def fact(n):
    return 1 if n == 0 else n * fact(n-1)

2. String Problems

Q4. Reverse string

print(input()[::-1])

Q5. Check palindrome

s = input()
print(s == s[::-1])

Q6. Count vowels

print(sum(1 for c in input() if c.lower() in 'aeiou'))

3. List Problems

Q7. Find max element

print(max([1,2,3]))

Q8. Remove duplicates

print(list(set([1,2,2,3])))

Q9. Sort list

lst = [3,1,2]
lst.sort()

4. Dictionary Problems

Q10. Frequency count

lst = [1,2,2,3]
f = {}
for i in lst:
    f[i] = f.get(i,0)+1

5. DSA Problems

Q11. Binary search

def bs(arr, x):
    l, r = 0, len(arr)-1
    while l <= r:
        m = (l+r)//2
        if arr[m] == x:
            return m
        elif arr[m] < x:
            l = m+1
        else:
            r = m-1

Q12. Fibonacci DP

def fib(n):
    dp = [0,1]
    for i in range(2,n+1):
        dp.append(dp[i-1]+dp[i-2])
    return dp[n]

6. Advanced Problems

Q13. Two sum problem

def two_sum(nums, target):
    d = {}
    for i, n in enumerate(nums):
        if target-n in d:
            return [d[target-n], i]
        d[n] = i

Q14. Longest substring

def longest(s):
    st=set();l=0;res=0
    for r in range(len(s)):
        while s[r] in st:
            st.remove(s[l]);l+=1
        st.add(s[r]);res=max(res,r-l+1)
    return res

7. Practice Problems (More)

1. Prime numbers.

2. Armstrong number.

3. Matrix multiplication.

4. Merge intervals.

5. Rotate array.

8. Interview Tips

1. Practice daily.

2. Focus on DSA.

3. Write clean code.

4. Optimize solutions.

Conclusion

Coding interview preparation requires consistent practice and understanding of problem-solving techniques.

Use this guide to strengthen your skills and crack technical interviews.