Hello lynda lesson | Python Fiddle

def main():
	print "Hello World"
    # Python does not have scope delemiters, it uses indents.

# dec var    
f = 0;
print f

#re dec var
f = "ABC";
print f

#strongly typed language
print "String type " + 123
#above line will error, will not convert int to str when run.
#this will work
print "String type " + str(123)
#converts to string on run.

#global vs local vars.
def someFunction()
	global f #tell function this is a global var/effects the value globally
    f = "def"
    pring f #will return DEF
    
someFunction()
print f #will return 0 again

del f #deletes the variable
print f #will error, f is not defined due to del cmd (undefine in realtime)

## FUNCTIONS ##

#colon denotes the scope of the function is starting, has to be indented
def func1():
    print "I am a function"
   
    
func1() #runs the function above

print func1() #runs the function -- but no return value, trying to print whatever return value was - will return python default none

print func1 #print function 1 without invoke -- prints the value of the func1 object - not useful but see how python treats objects

#function that takes arguments

def func2(arg1,arg2):
    print arg1, " ",arg2
    
    
func2(10,20)

def cube(x):
    return x*x*x

print cube(3)

#func with default value for argument
def power(num, x=1):
    result = 1;
    for i in range(x):
        result = result * num
    return result

print power(2)
print power(2,3) #or to overide the default arg value 'x'
print power(x=2,num=3) #args do not have to be in order if named

#func with multipul arguments
def multi_add(*args):
    result = 0; #local var
    for x in args: #loop arguments and add each time
        result = result + x
	return result #return to func call

print multi_add(2,3,4)

## CONDITIONALS ##

x, y = 1000, 100

if(x < y):
    st = "x is less than y"
elif(x == y): #REMEMBER elif is else if
    st = "x and y is the same"
else:
    st = "x is greater than y"
print st

#conditionals all on one line.
#same as the if construct above but all on one line.
st = "x is less than y" if (x < y) else "x is greater than or equal to y"
print st

## LOOPS ##

#Tell python that from datetime mod, you want to import the date time classes

from datetime import date
today = date.today()
print "Today's daye is ", today

#or print individual components.
print "Today's Date is", today.day, today.month, today.year

#retrive weekday number
print "Today's weekday #:" , today.weekday()

#datetime

time = datetime.now()

#creat current time class
t = datetime.time(datetime.now())

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