PYTHON

PYTHON

1. decomposition

   • breaking down the problem into smaller simpler steps

2. algorithm

   • sequencing instructions
     • strings
       • string literals
         • print("hello")
       • string to a variable
         • a="hello"
           • print (a)
       • strings are arrays
         • https://www.w3schools.com/python/showpython.asp?filename=demo_string1
       • slicing
         • b = "Hello, World!"
           • print(b[2:5])
             • the outcome
               • llo
       • negetive indexing
   • functions
     • functions are special built-in routines that do a specific job
     • functions appear in purple

3. debugging

   • fixing the mistakes
     • print (hello)
       • incorrect
       • syntax error
     • print ("hello")
       • correct

4. variables

   • a reserved memory location to store values
   • names of variables
     • cannot start with a number
     • a variable name can contain only numbers, letters and underscores
     • can't use a python "reserved word" as a variable name otherwise it will result in a syntax error

5. comments

   • comments are used to document your program and make it easier to understand your code
     • comments usually start with