python-course/lesson04/data_types.py at 334914c8368923f12e85460b4461d5f0e6db375e · gitdagray/python-course · GitHub

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import math
# String data type

# literal assignment

# first = "Dave"
# last = "Gray"

# print(type(first))
# print(type(first) == str)
# print(isinstance(first, str))

# constructor function
# pizza = str("Pepperoni")
# print(type(pizza))
# print(type(pizza) == str)
# print(isinstance(pizza, str))

# Concatenation
# fullname = first + " " + last
# print(fullname)

# fullname += "!"
# print(fullname)

# # Casting a number to a string
# decade = str(1980)
# print(type(decade))
# print(decade)

# statement = "I like rock music from the " + decade + "s."
# print(statement)

# # Multiple lines
# multiline = '''
# Hey, how are you?

# I was just checking in.
#                                 All good?

# '''
# print(multiline)

# # Escaping special characters
# sentence = 'I\'m back at work!\tHey!\n\nWhere\'s this at\\located?'
# print(sentence)

# # String Methods

# print(first)
# print(first.lower())
# print(first.upper())
# print(first)

# print(multiline.title())
# print(multiline.replace("good", "ok"))
# print(multiline)

# print(len(multiline))
# multiline += "                                        "
# multiline = "                  " + multiline
# print(len(multiline))

# print(len(multiline.strip()))
# print(len(multiline.lstrip()))
# print(len(multiline.rstrip()))

# print("")

# # Build a menu
# title = "menu".upper()
# print(title.center(20, "="))
# print("Coffee".ljust(16, ".") + "$1".rjust(4))
# print("Muffin".ljust(16, ".") + "$2".rjust(4))
# print("Cheesecake".ljust(16, ".") + "$4".rjust(4))

# print("")

# # string index values
# print(first[1])
# print(first[-1])
# print(first[1:-1])
# print(first[1:])

# # Some methods return boolean data
# print(first.startswith("D"))
# print(first.endswith("Z"))


# # Boolean data type
# myvalue = True
# x = bool(False)
# print(type(x))
# print(isinstance(myvalue, bool))

# # Numeric data types

# # integer type
# price = 100
# best_price = int(80)
# print(type(price))
# print(isinstance(best_price, int))

# # float type
# gpa = 3.28
# y = float(1.14)
# print(type(gpa))

# # complex type
# comp_value = 5+3j
# print(type(comp_value))
# print(comp_value.real)
# print(comp_value.imag)

# # Built-in functions for numbers

# print(abs(gpa))
# print(abs(gpa * -1))

# print(round(gpa))

# print(round(gpa, 1))


# print(math.pi)
# print(math.sqrt(64))
# print(math.ceil(gpa))
# print(math.floor(gpa))

# # Casting a string to a number
# zipcode = "10001"
# zip_value = int(zipcode)
# print(type(zip_value))

# # Error if you attempt to cast incorrect data
# # zip_value = int("New York")