help & tab completion | Python

Topics discussed in this video: a)Getting help in Python & some important methods related to String-- 1).isalpha() 2).isalnum() 3).islower() 4).isupper() b)tab completion in Python Python for beginners: https://www.youtube.com/watch?v=egq7Z...

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what are the difference between LIST , TUPLE and SET in python ?

The tuple, list, set, dictionary are trying to solve the most important problems in programming, called, storage of data and retrieval of stored data in a way that is both easy to use, to code and to read for the programmers.
The big problems are:
- space availability
- insertion
- searching by value or position
- updating
- make the operations faster for big/huge data sets
Tuple:
When you only store data that you aren't changing and don't need to do search by value as you know the position.
List:
When you store data that you changing, inserting if fast and don't need to do search/update by value as you know the position
Set:
When you store data that changes from times to time, but most importantly you need very fast search by value as you don't know position then you use sets.The search is very fast as the set is indexed in memory and fast binary search used. Inserting and deletion is slow.
Dictionary:
When you need fast search, data doesn't change often, few updates and inserts. Is just advanced set where you store a group of key and value and search by the key.

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Largest Number At Least Twice of Others | Python

Python for beginners: https://www.youtube.com/watch?v=egq7Z...

Code:

class Solution:

    def dominantIndex(self, nums: List[int]) -> int:

        f=max(nums);

        rs=nums.index(f);

        u=[];

        g=0;

        for i in nums:

            if(i!=f):

                u.append(i);

        if(len(u)!=0):

            g=max(u);

        if(f>=2*g):

            return rs;

        else:

            return -1;

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Ransom Note | Python

Python for beginners: https://www.youtube.com/watch?v=egq7Z...

Code:


class Solution:
    def canConstruct(self, ransomNote: str, magazine: str) -> bool:
        g=0;
        for i in ransomNote:
            t=ransomNote.count(i);
            s=magazine.count(i);
            if(t>s):
                g+=1;
        if(g==0):
            return True;
        else:
            return False;


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Search Insert Position | Python

Python for beginners: https://www.youtube.com/watch?v=egq7Z...

Code:

class Solution:

    def searchInsert(self, nums: List[int], target: int) -> int:

        if(target in nums):

            return nums.index(target);

        else:

            if(target<min(nums)):

                return 0;

            elif(target>max(nums)):

                return len(nums);

            else:

                g=0;

                m=0;

                while(g<len(nums)):

                    if(nums[g]>target):

                        m=g;

                        break;

                    g=g+1;

                return m;

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Intersection of Two Arrays | Python

Check the problem statement here: The intersection of Two Arrays: https://leetcode.com/problems/interse... Python for beginners: https://www.youtube.com/watch?v=egq7Z...

Code:


class Solution:
    def intersection(self, nums1: List[int], nums2: List[int]) -> List[int]:
        output=[];
        for i in nums1:
            if(i in nums2 and i not in output):
                output.append(i);
        return output;


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Jewels and Stones | Python

Prerequisites for solving this particular question: String Immutability & count method | Python | Castor Classes https://www.youtube.com/watch?v=Am1vX... Iterate over a list & string | List in Python | Part 4 | Castor Classes https://www.youtube.com/watch?v=4Zrfk... You can get the problem statement here: https://leetcode.com/problems/jewels-... Python for beginners: https://www.youtube.com/watch?v=egq7Z...

Code:

class Solution:

    def numJewelsInStones(self, J: str, S: str) -> int:

        c=0;

        for i in J:

            c+=S.count(i);

        return c;

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If Expressions in Python

Prerequisite:

if else command | Python 
https://www.youtube.com/watch?v=9GJWK...

Java code used in this video:

import java.util.*;
public class Hello {
public static void main(String args[])
{
 Scanner obj=new Scanner(System.in);
 int x=obj.nextInt();
 String s=(x%2==0)?"Even":"Odd";
 System.out.println(s);
}
}

Python for beginners:
https://www.youtube.com/watch?v=egq7Z...

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None value in Python

Python for beginners: 

https://www.youtube.com/watch?v=egq7Z...


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Separate 0’s and 1’s in an array | Python

Python for beginners: 
https://www.youtube.com/watch?v=egq7Z..

Code:


l=int(input());

i=0;

m=[];

zeros=0;

while(i<l):

    y=int(input());

    if(y==0):

        zeros+=1;

    m.append(y);

    i+=1;

i=0;

while(i<l):

    if(i<zeros):

        m[i]=0;

    else:

        m[i]=1;

    i=i+1;

print(m);


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Find first set bit | Python

Python for beginners:
https://www.youtube.com/watch?v=egq7Z...

Code:


t=int(input());
i=0;
while(i<t):
    a=int(input());
    rs=bin(a)[2:];
    y=list(rs);
    y.reverse();
    if('1' in y):
        io=y.index('1');
        print(io+1);
    else:
        print(0);
    i=i+1;


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List membership Testing using in | Part 8 | Python

Code: class Solution: def checkIfExist(self, arr: List[int]) -> bool: g=0; for i in arr: if(i*2 in arr and i!=0): g=1; break; elif(i*2 in arr and arr.count(2*i)>=2): g=1; break; if(g==0): return False; else: return True;

Problem Link: Check If N and Its Double Exist: https://leetcode.com/problems/check-i... Python for beginners: https://www.youtube.com/watch?v=egq7Z...

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Prime Number of Set Bits in Binary Representation | Python

Prerequisite: Brian Kernighan’s Algorithm | Python | Castor Classes https://www.youtube.com/watch?v=DUSCd... Python for beginners: https://www.youtube.com/watch?v=egq7Z...

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Brian Kernighan’s Algorithm | Python

Code: class Solution: def countBits(self, num: int) -> List[int]: bum=[]; i=0; while(i<=num): bum.append(i); i=i+1; output=[]; for i in bum: count=0; while(i>0): i=i&i-1; count+=1;#count=count+1; output.append(count); return output;

Number of 1 Bits https://leetcode.com/problems/number-... Counting Bits https://leetcode.com/problems/countin... Code is given in the comment section. Python for beginners: https://www.youtube.com/watch?v=egq7Z...

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Last Stone Weight | Python

Code: class Solution: def lastStoneWeight(self, stones: List[int]) -> int: while(len(stones)>1): heaviest=max(stones); stones.remove(heaviest); heavier=max(stones); stones.remove(heavier); if(heaviest!=heavier): stones.append(heaviest-heavier); if(len(stones)==0): return 0; else: return stones[0];

Python for beginners: https://www.youtube.com/watch?v=egq7Z...

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Move Zeroes | Python

Code: class Solution: def moveZeroes(self, nums: List[int]) -> None: g=nums.count(0); i=0; while(i<g): nums.remove(0); nums.append(0); i=i+1;

Python for beginners: https://www.youtube.com/watch?v=egq7Z...

Telegram: https://t.me/clcoding_python https://www.facebook.com/pirawenpython/

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Counting Elements | Python

Code :

class Solution: def countElements(self, arr: List[int]) -> int: output=0; for i in arr: if(i+1 in arr): output+=1; return output;
Python for beginners: https://www.youtube.com/watch?v=egq7Z..

Telegram: https://t.me/clcoding_python

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Program to find whether a no is power of two or not | Python

Prerequisite: Data Type Conversion | Python | Castor Classes https://www.youtube.com/watch?v=z8yw6... Turn off the rightmost set bit | Python | Castor Classes https://www.youtube.com/watch?v=ol4VW... Relationship between binary representation of n & n-1 | Python | Castor Classes https://www.youtube.com/watch?v=iTxc9... Python for beginners: https://www.youtube.com/watch?v=egq7Z..

Telegram: https://t.me/clcoding_python

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Escape Sequence in Python

Escape Sequence - 

Escape sequences are control character used to move the cursor and print characters such as ',".\ and so on.

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Python Input() Function

Input( )

Python provides us the facility to take input from user using Input( ) function. This function prompts the user to input a value.

For example :

Name = input("Enter Your Name");
print(Name);

Output will be the name as entered by the user.

Let us take the example again:

name = input("Enter Your Name:");
print("Welcome Mr.",name);

Here suppose the user enter the name as "xyz Kumar" so the variable name will contain xyz Kumar. In such case the output of the program will be:

Output      Welcome Mr. xyz Kumar


 Please note that the input( ) accepts the input only in string format. so, if any mathematical calculation is to be performed, we need to convert the input to integer format. for converting the input to integer format Python provide us a function called :

Program without using int( ) function :

a = input ("Enter 1st Number:");
b =  input("Enter 2nd Number:");
c = a+b;
print("Addition =",c);

In this case if the value of a & b as given by user is 5 & 6 respectively then the output will be 56. As 5 & 6 will be treated as string and not integer.

Program using int( ) function

a = int(input("Enter 1st Number:"));
b = int(input("Enter 2nd Number:"));
c=a+b;
print("Addition=",c);

 In this case if the value of a & b as given by user is 5 & 6 then output will be 11 as we have converted the input from string to integer format.

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