Python' s 50 things that you must know about python

1) Python is a high level language like(c++ , java , PHP)

2) low level language known as (machin language, assembly language )
3) high level language take more time than low level language
4) all program are in high level language , specialized will be low level
5) interpreter read high level and compiler translate to low level language
6) translated by the compiler known as object code or executable
7) IDE (integrated development program called idle
8) .py extension used to execute in pythons
9) found by Guido van rorsun in late eighteen and early 90's in Netherland
10) easytolearn :- it have few keyword , clearly defined syntax
11) easy to read :- easy to maintain
12) GUI supports
13) interactive interpreter
14) debugging (syntax error, runtime error,symmantic error)
15) symmantic error (compile) but (not showing obvious output)
16) finding of symmantic error can be tricky
17) rich , challenging and interesting part of programming
18) formal language is used for mathematician used and in programming language
19) to make ordered dictionary use " from collection ordered dict "
20) 1 is integer and ' hello world ' is string identify string ( because its always in quotation)
21) if we put number in quotation marks will show string type
22) variable (a) = 17 [the variable a assign value as 17]
23) 27=n (its wrong structure)
24) a=7 print (a) >>>7   , type(a) >>>integer (because a=7 and value of variable is integer)
25) keyword cannot be variable like:-
      And , del , from , not , while , as , elif , global , or , with , assert , else , if , pass , class , exec , in vaise , continue , finally , is , return , def , for , lambda , try
26) the value of the operator is operands
27) expression is a combination of value , variable and operator
28) script mod -> program can be modify and can be save interactive mode ->  program gives instant output
29) in if statement data is compared

Flow diagram :-

30) nested of if statement:- elif to make another condition between if and else.
31) loop continues until we reach the last item in the sequence

32) e.g. :- for loop with logic
33) number = [6,5,3,8,4,2,5,4,11]
      Sum= 0
      For val in number:
      Sum = sum +val
      Print ("the sum is : ",sum)

34) while loop in python is used to repeat over a  block of code as expression is true
35) while (variable here) text_expression:-
36) while loop run when condition is true and this code will run until condition will false
Diagram below :-

37) n=10
      Sum = 0
      I=0
      While I<n
      Sum=sum + 1
      I=I+1†  #update counter
      Print (" the sum I'd : ",sum)

Print (" the sum is : ",sum)

38)nested loop (break):-
Break is another loop in one loop and break will terminate the innermost loop. Its break the rest information

39) code inside and outside of for loop :-
For variable in sequence:
      #code inside of the loop

#code outside of for loop

40) e.g. of break loop statement 
      For val in " thing":
        If val =="I":
            Break
        Print(val)

Print("the end")

Output:-
s
t
r
the end
       
41) the continue statement :-
      It is used to skip rest of the code

42) where break stop the loop here continue skip rest of loop's code if it got to the true

43) continue code
       For val in "string":
           If cal==" I"
           Continue
           Print(val)

Output:-s
t
r
i
n
g

44)left hand side must be variable name not any assignment operator
45)Len only count the (str) string which is character
46)float convert to into but str count if float to int happen only before (.) Part will be shows

47)true is predefined value but true is not (case matters)

48) abs(x) - the absolute value of x and the positive 0 to x
      Ceil(x) - the ceiling of x the smallest         integer integer not less than x
      Cmp(x,y) - (-1 if x<y) (0 if x==y) (1 if x>y)
      Exp(x) - the exponential of x:e^x
      Fabs(x) - the absolute value of x
      Floor(x) - the largest integer of x not larger than x
      Log(x) - the natural logarithm of x for x>0
      Log10(x) - the base 10 logarithm of x
      Max(x1,x2.....) - largest argument : value closest to positive infinity
      Min(x1,x2....) - smallest argument : value closest to positive infinity
      Modf(x) - the integer part is returned as a float
      Pow(x,y) - the value of x**y
      Round(x[,n]) - x rounded to n digit from the decimal point python round away

49) abs =positive (absolute value)
       Print("abs(-45):",abs(-45))

Output :-
Abs(-45):45

50)math.Ceil(integer.remain(float))here
Math.pi = 4
51)math.exp(int.remaining)
Math.pi = 23.140692632779267

Output value will so long even after the decimal point like the math.pi value

52) abs ( ) and Fabs ( )is same function but abs is built in and fbs need to import
      Import.math    # import
      Math.Fabs(x)     # function call

Print("math.fabs(-45.17):",math.fabs(-45.17))
Print("math.fabs(math.pi):",math.fabs(math.pi))

Output:-

53) math.floor( ) return the largest integer but not greater than x
    Print ("math.floor(-45.17):" math.floor(-45.17))
    Print("math.pi",math.floor(math.pi))

Output:-
Math.floor(-45.17): -46
Math.pi: 3

54) math.logreturn natural logarithm
55) print("(100.12) of math.log : " , math.log(100.12))
     Print("math.pi : ",math.log (math.pi))

Output: -
(100.12) of math.log : 4.6063694665635735
Math.pi : 1.1447298858494002