Boto is the Amazon Web Services (AWS) SDK for Python, which allows Python developers to write software that makes use of Amazon services like S3 and EC2. Boto provides an easy to use, object-oriented API as well as low-level direct service access

 We will be using three different python modules. 

1. boto3
2. datetime

datetime module contains classes and methods for manipulating dates and times

#!/usr/bin/python
import boto3
import datetime

# Calculate timeLimit for EBS Snapshots
time_limit = datetime.datetime.now() - datetime.timedelta(days=7)
# ec2 object creation
ec2client = boto3.client('ec2')


# This function is used to retrive the ec2 instances from the given region
def get_ec2_instances():
    instance_list = ec2client.describe_instances()
    # Return Instances List
    return instance_list


# This function is used to retrive the volumes list by instance id
def get_volumes_by_instance_id(instance_id):
    volume_filters = [{"Name": "attachment.instance-id", "Values": [instance_id]}]
    volume_list = ec2client.describe_volumes(Filters=volume_filters)
    return volume_list


# This function is used to retrive the snapshots by volume id
def get_ebs_snapshots_by_volume_id(volume_id):
    snapshot_filters = [{"Name": "volume-id", "Values": [volume_id]}]
    snapshot_list = ec2client.describe_snapshots(Filters=snapshot_filters)
    return snapshot_list


instance_list_info = get_ec2_instances()
for ec2_reservation in instance_list_info["Reservations"]:

    for ec2_instance in ec2_reservation["Instances"]:

        volume_list_info = get_volumes_by_instance_id(ec2_instance["InstanceId"])

        for volume_info in volume_list_info["Volumes"]:

            snapshot_list_info = get_ebs_snapshots_by_volume_id(volume_info["VolumeId"])

            for snapshot_info in snapshot_list_info["Snapshots"]:

                if snapshot_info['StartTime'].date() >= time_limit.date():

                    print("Instance  ID  :", ec2_instance["InstanceId"])
                    print("Volume    ID  :", volume_info["VolumeId"])
                    print(snapshot_info['SnapshotId'], snapshot_info['StartTime'].date())

Examples

1. Use case 1:

• when account is inserted, automatically contact also created for that account.

• Explanation:

---

2. Use Case 2:

• Create a trigger on opportunity that throws error if Amount is less than 5000

• Explanation:

---

3. Use Case 3:

• If a New record is created, Amount should not be less than 5k If an Existing record is being updated , Amount should not be less than 3k

---

• Create a contact record on New Opportunity Insert

---

This is a simple c language project using structures  concept.Basic bank operations 
are implemented in this simple project there will be a menu driven option for the
user based on the user selection operations will be done.

 

/*Simple c project using structures*/
#include<stdio.h>
#include<conio.h>
void creation();
void deposit();
void withdraw();
void bal();
int a=0,i = 101;
struct bank
{
int no;
char name[20];
float bal;
float dep;
}s[20];
void main()
{
int ch;
while(1)
{
clrscr();
printf("\n*********************");
printf("\n BANKING ");
printf("\n*********************");
printf("\n1-Creation");
printf("\n2-Deposit");
printf("\n3-Withdraw");
printf("\n4-Balance Enquiry");
printf("\n5-Exit");
printf("\nEnter your choice");
scanf("%d",&ch);
switch(ch)
{
case 1: creation();
break;
case 2: deposit();
break;
case 3: withdraw();
break;
case 4: bal();
break;
case 5: exit(0);
defalut: printf("Enter 1-5 only");
getch();
}
}
}
void creation()
{
printf("\n*************************************");
printf("\n ACCOUNT CREATION ");
printf("\n*************************************");
printf("\nYour Account Number is :%d",i);
s[a].no = i;
printf("\nEnter your Name:");
scanf("%s",s[a].name);
printf("\nYour Deposit is Minimum Rs.500");
s[a].dep=500;
a++;
i++;
getch();
}
void deposit()
{
int no,b=0,m=0;
float aa;
printf("\n*************************************");
printf("\n DEPOSIT ");
printf("\n*************************************");
printf("\nEnter your Account Number");
scanf("%d",&no);
for(b=0;b<i;b++)
{
if(s[b].no == no)
m = b;
}
if(s[m].no == no)
{
printf("\n Account Number : %d",s[m].no);
printf("\n Name : %s",s[m].name);
printf("\n Deposit : %f",s[m].dep);
printf("\n How Much Deposited Now:");
scanf("%f",&aa);
s[m].dep+=aa;
printf("\nDeposit Amount is :%f",s[m].dep);
getch();
}
else
{
printf("\nACCOUNT NUMBER IS INVALID");
getch();
}
}
void withdraw()
{
int no,b=0,m=0;
float aa;
printf("\n*************************************");
printf("\n WITHDRAW ");
printf("\n*************************************");
printf("\nEnter your Account Number");
scanf("%d",&no);
for(b=0;b<i;b++)
{
if(s[b].no == no)
m = b;
}
if(s[m].no == no)
{
printf("\n Account Number : %d",s[m].no);
printf("\n Name : %s",s[m].name);
printf("\n Deposit : %f",s[m].dep);
printf("\n How Much Withdraw Now:");
scanf("%f",&aa);
if(s[m].dep<aa+500)
{
printf("\nCANNOT WITHDRAW YOUR ACCOUNT HAS MINIMUM BALANCE");
getch();
}
else
{
s[m].dep-=aa;
printf("\nThe Balance Amount is:%f",s[m].dep);
}
}
else
{
printf("INVALID");
getch();
}
getch();
}
void bal()
{ int no,b=0,m=0;
float aa;
printf("\n*************************************");
printf("\n BALANCE ENQUIRY ");
printf("\n*************************************");
printf("\nEnter your Account Number");
scanf("%d",&no);
for(b=0;b<i;b++)
{
if(s[b].no == no)
m = b;
}
if(s[m].no==no)
{
printf("\n Account Number : %d",s[m].no);
printf("\n Name : %s",s[m].name);
printf("\n Deposit : %f",s[m].dep);
getch();
}
else
{
printf("INVALID");
getch();
}
}

Hi Friends Learning core java is a first step in to java programming we are confused what topics are come under core java section and core java is very essential for building logic's  for every high end applications,so i listed all topics in table format.  

Basic Java	OOPS Concepts	Advanced Topics of java
Learn introduction	Objects and Class	String handling
Know features of java	Polymorphism	Exception handling
Setting class path	Constructor	Multithreading
Know About Data Types	This reference	Synchronization
Write basic program	Garbage collection	Enumeration
Variable rules	Java modifiers	Auto Boxing and Un Boxing
Operators in java	Inheritance	Java I/O stream
	Aggregation	Serialization
	Command line arguments	Generics
	Packages	Collection framework
	Abstraction	Java Networking
	interfaces	Applets
	Nested class	AWT and Swings

Java is freely available on Oracle's Website. Download the latest version of JDK (Java Development Kit) on your operating system. Install JDK on your machine. Once you have installed Java on your machine you would need to set environment variable to point to correct installation directory. 

PROCEDURE:

   Assuming that you have installed Java in C:\ Program files/ Java / JDK directory

Step 1:Right click on my computer and select properties.
















 











Step 3:Click on Environment Variables button.

 























Step 4: Now alter the path variable so that it also contains the path to JDK installed
           directory.

 





















 Step 5: Select path and click on edit and past class path.Click on ok button.
 Step 6: Now go to command prompt and type java and javac, If you successfully
            make it you will see commands acknowledge.
 Step 7: That's it your done!

Knowledge of c programming language is very necessary for every computer guy.Having knowledge in c programming one can crack technical interview easily .The very basic c programs i have listed here are very important for interview. 




1. C Program to print Hello World?

2.C Program to check whether a given integer is odd or even?

3.C Program to Check if a given Integer is Positive or Negative?

4.C program to find the biggest of three numbers?

5.C Program for finding the Sum of Odd & Even Numbers?

6.C Program to Reverse a Number and also check Palindrome or not?

7.C Program for swapping values of two numbers?

8.C Program to Reverse a Given Number?

9.C Program to check leap year or not?

10.C program for Sum of first 50 Natural Numbers?

11. C Program to print statement without using semicolon?