print formatting it is the process of combining variables and strings toger to display the formatted output
1).format method: example: i need to dispaly statement as : my emplyoee name is aa and employeid is 111 name="aa" id=111 print("my employee name is {} and employeid is {}".format(name,id))
2)f-method print(f"my employee name is {name} employeid is {id}")
input method
f-method and format method in input string-group of characters in python indexing allows the user to grab paratial values from any data indexing starts from 0 to n-1
-Why python is required for DevOps even though we have shell scripting 1.python supports reverse indexing . it will start display from last character. for last character index is -1 python has advance/adavantage features compare to shell scripting 2.It is independent of OS. where as bash scripting works only on Linux OS 3.For writing more complex logic which we can't do it in shell scripting 4.Python provides better error handling compared with shell scripting 5.number of lines of code will be reduced compared with shell scripting 6.Easy to learn and understand
python modules Modules:
- SYS module : This is a module which is used to print the system related values. Using this module we can access variables maintained by the python interpreter and functions that interact with the interpreter.To use this module need to import sys module. syntax: import sys
a) sys.argv :(argv-argument vector) It is a list in python which contains the command line arguments passed to the script. The first element is the script name. example: import sys print(sys.argv) - It will print the name and argument passed print(sys.argv[1]) - It will print the first command line argument passed
b) sys.path : It will print the current system path import sys print(sys.path) c) sys.exit : It is used to exit from the python interpreter by raising the exception. import sys sys.exit(0) sys.exit(f"Execution stopped")
- OS module : This module provides the way for interacting with the OS.
- os.getcwd() - Display the current working directory
- os.makedirs() - It is used to create the directory os.makedirs("pythondir", exist_ok=True) -
- os.listdir() - It will list all the files and directories print(os.listdir("D:\Drives\DRC\python\pythonProject"))
- os.chdir() - It is used to change the directory os.chdir("pythondir") print(os.getcwd())
- os.path.isfile() - It will check whether it is a file or not and return true if it exists. print(os.path.isfile("1.txt")) - checks file exist print(os.path.exists("pythondir")) - checks directory exist
- os.path.join() - It is used to join the path
- os.path.basename() - It will return the base name of the file.
- os.walk() - It is used to walk through all the directory and sub directoy and in each iteration it returns the current path, all the files and directories.
string a group of characters. 1)in pyhon indexing allows the user to grab partial values from any data indexing starts from 0 to n-1 python has advance/adantages features compare to shell scripting 2) python also support reverse indexing. it will start display from last character. for last character index is -1
List list is group of elements with different type or same type and it is created using a pair of []. using index, the elements of list can be accessed
Dictionary Is key-value pair, is is created pair of {} using key-value of dictionary can be accessed