variables.py

# 
# Example file for variables
# LinkedIn Learning Python course by Joe Marini
#


# Basic data types in Python: Numbers, Strings, Booleans, Sequences, Dictionaries
myint = 5
myfloat = 13.2
mystr = "This is a string"
mybool = True
mylist = [0, 1, "two", 3.2, False]
mytuple = (0, 1, 2)
mydict = {"one" : 1, "two" : 2}

# print(myint)
# print(myfloat)
# print(mystr)
# print(mybool)
# print(mylist)
# print(mytuple)
# print(mydict)

# re-declaring a variable works
myint = 'abc'
print(myint)

# to access a member of a sequence type, use []
print(mylist[2])
print(mytuple[1])

# use slices to get parts of a sequence
print(mylist[1:5])
print(mylist[1:5:2]) #third parameter is step value

# you can use slices to reverse a sequence
print(mylist[::-1])

# dictionaries are accessed via keys
print(mydict["one"])

# ERROR: variables of different types cannot be combined
# print(mystr + 123)
# Python is strongly typed
print(mystr + str(123))

# Global vs. local variables in functions
def someFunction():
    global mystr
    mystr = "def"
    print(mystr)

someFunction()
print(mystr)

del mystr
# print(mystr)
# Can delete variables