Python is a widely used general-purpose, high-level programming language.Its design philosophy emphasizes code readability, and its syntax allows programmers to express concepts in fewer lines of code than would be possible in languages such as C++ or Java.The language provides constructs intended to enable clear programs on both a small and large scale.

Python is an interactive language that allows us to execute statements individually and see their results. In other words, you don't have to write a full code and compile it before you see the results as in other languages like C++ and Java.

Let's look at Python's input reading method.

That's one way of doing it for yourself. But in competitive programming we don't ask questions. We only answer them. So we will only use raw_input() to read a string without asking any question to the system.

Now, the three basic arithmetic operators are the following:

Addition (+)

Subtraction (-)

Multiplication (*)

In Python there are two kinds of divisions, namely integer division and float division.

A long time ago during the era of Python 2, when you divided an integer with another integer, no matter the result, it was always an integer.

Example

And in order to make this a float division, you'd need to convert one of the arguments into a float.

Example

Since Python doesn't have data types declared in advance, you never know when you want integers and when you want a float. And since floats lose precision, it's inadvisable to use them in integral calculations.

To solve this problem, future Python modules included a new type of division called integer division given by the operator //

Now / performs float division and // performs integer division.

In Python 2 we will import a module from __future__ called division.

One of the built-in functions of Python is divmod, which takes two arguments a and b and returns a tuple containing the quotient of a/b (a//b) and remainder a.

Here a/b can be compared with integer division a//b.

We have only heard of the powers of Python, so far; now we will witness them :)

Power or exponent in Python can be calculated using the built-in power function. Which can be called as for ab

or

It's also possible to calculate abmodm.

This is very helpful in computations where you have to print result % mod.

Note that here a and b can be floats and even negatives; but if a third argument is present, b cannot be negative.

Integers in Python can be as big as the bytes in your machine's memory. There is no limit of 2^31−1 (c++ int) or 263−1 (C++ long long int).

Loops are control structures that iterate over a range to perform a certain task.

There are two kinds of loops in Python.

For Loop

While loop

range(0,5) returns a list of integers from 0 to 5 [0,1,2,3,4].

Lets see about Python Datatypes in another post.

Python is an interactive language that allows us to execute statements individually and see their results. In other words, you don't have to write a full code and compile it before you see the results as in other languages like C++ and Java.

*print "Hello World!"**my_string = "Hello World!"**print my_string*Let's look at Python's input reading method.

*>>> name = raw_input("Hey what's your name?\n")**Hey what's your name?**Arunkumar Palaniappan**>>> print name**Arunkumar Palaniappan*That's one way of doing it for yourself. But in competitive programming we don't ask questions. We only answer them. So we will only use raw_input() to read a string without asking any question to the system.

Now, the three basic arithmetic operators are the following:

Addition (+)

Subtraction (-)

Multiplication (*)

In Python there are two kinds of divisions, namely integer division and float division.

A long time ago during the era of Python 2, when you divided an integer with another integer, no matter the result, it was always an integer.

Example

*>>> 4/3**1*And in order to make this a float division, you'd need to convert one of the arguments into a float.

Example

*>>> 4/3.0**1.3333333333333333*Since Python doesn't have data types declared in advance, you never know when you want integers and when you want a float. And since floats lose precision, it's inadvisable to use them in integral calculations.

To solve this problem, future Python modules included a new type of division called integer division given by the operator //

Now / performs float division and // performs integer division.

In Python 2 we will import a module from __future__ called division.

*>>> from __future__ import division**>>> print 4/3**1.3333333333333333**>>> print 4//3**1*One of the built-in functions of Python is divmod, which takes two arguments a and b and returns a tuple containing the quotient of a/b (a//b) and remainder a.

Here a/b can be compared with integer division a//b.

*>>> print divmod(177,10)**(17, 7)**Here 177/10 => 17 and 177%10 => 7*We have only heard of the powers of Python, so far; now we will witness them :)

Power or exponent in Python can be calculated using the built-in power function. Which can be called as for ab

*>>> pow(a,b)*or

*>>> a**b*It's also possible to calculate abmodm.

*>>> pow(a,b,m)*This is very helpful in computations where you have to print result % mod.

Note that here a and b can be floats and even negatives; but if a third argument is present, b cannot be negative.

Integers in Python can be as big as the bytes in your machine's memory. There is no limit of 2^31−1 (c++ int) or 263−1 (C++ long long int).

Loops are control structures that iterate over a range to perform a certain task.

There are two kinds of loops in Python.

For Loop

*for i in range(0,5):**print i*

While loop

*i = 0**while i < 5:**print i**i+=1*range(0,5) returns a list of integers from 0 to 5 [0,1,2,3,4].

Lets see about Python Datatypes in another post.

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