import os }

clear=lambda:os.system('cls') }

clear } ---->to clear screen

Data types = integer, bulion and string

Python

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Python script-when doing a normal procedural way calling python without oops concept is called python script.

Python program- If we put concept of object oriented an oops and trying to run then we can call it as program

/ -it is used separate one big line into two.

; - it is used to separate two line.

String – it is value of char or num or combination of both

Executables – python file.name.py or ./file.python(this should have exe permission(7/-x))

Variables – are nothing but reserved memory locations to store some value.

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Variables

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no. of items=127

no. of items="127"

total price=30

no.of items+1= we get an error bcoz its treats no.of items as string so to get result we should use "int(no.of items)"

price of one item= total price/no.of items(30/127) we result as 0, to get result accuratly we should use "price of one itemo.of items=

#float(total price)/no.of items

#round(float(total price)/no.of items,4) ----------> if we want to round results for 4 digits.

#type(no.of items) -------> it tells about which variable no.of items is

#total price +=1.6

#total price *=2

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STRINGS

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SERVER_NAME = "tomcat" --------> we use " " to define string

SERVER_TYPE = 'appserver' -------> we also use ' ' to define string

#print SERVER_NAME -------> It will print server name as tomcat

#SERVER_DESC = """my tomcat application server""" --------> """ are used to define multiple strings

#print "server name: %s" % (SERVER_NAME)----->It prints results as server name: tomcat

#len(SERVER_DESC) -------> It gives lenth of the string(27)

#SERVER_DESC1 = "server" + SERVER_NAME + "is" + SERVER_TYPE

#print SERVER_DESC1

----> It prints strings and variables join result as server tomcat is appserver

SERVER_DESC1 = " ".join(("server", SERVER_NAME, "is", SERVER_TYPE))

#print SERVER DESC1

--------> It will join strings and variables

#"tomcat" in SERVER_DESC --------> It gives result as TRUE

#"apache" in SERVER_DESC --------> It gives result as FALSE

#SERVER_DESC.find("tomcat") ------> It gives lenth of tomcat in SERVER_DESC

#SERVER_DESC1[0:6] -------> It gives result as server which is first 6 letters in the SERVER_DESC1 variable.

#SERVER_DESC1[-9:0] -------> It gives result as appserver which is lenth of appserver in the SERVER_DESC1 variable from last.

#SERVER_DESC1[SERVER_DESC1.find("is"):] ---------> it gives result as is appserver

#SERVER_DESC1.replace("tomcat","apache") --------> it replaces the string

STRIP = " mystrip "

#STRIP.strip() ------> it removes white spaces in the STRIP string

#STRIP.lstrip() -------> it removes white spaces from left side of the string

#STRIP.rstrip() -------> it removes white spaces from right side of the string

@STRIP.rstrip("p ") -------> it removes white spaces from right side of the letter p in the string

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MODULES

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DEFINITION -----> Module is pre written function that we can add to our script.

#import subproces ---------> "subprocess" is the module which contains functions.

#dir(subprocess) ----------> it shows the available functions in subprocess module.

#host_name = subprocess.check_output("hostname") ---------> it is used to call a function in a module

#host_name

-----> it prints host name.

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