#PRENOTES
#=============================================================================
#Installation of python2.7
#print()


#DATA TYPES
#=============================================================================
def f():
    print("This is a user-defined function")
    return True


print("Some basic types in Python:")
print(type(2))           # int
print(type(2.2))         # float
print(type("2.2"))       # str  (string)
print(type(2 < 2.2))     # bool (boolean)
print(type(math))        # module
print(type(math.tan))    # builtin_function_or_method ("function" in Brython)
print(type(f))           # function (user-defined function)
print(type(type(42)))    # type
#x is an object
x = 42
print(x)
print(type(x))
x = "hello"
print(x)
print(type(x))
x = 5.0
print(x)
print(type(x))

print("Some builtin constants:")
print(True)
print(False)
print(None)

print("And some more constants in the math module:")
import math
print(math.pi)
print(math.e)

print("Strings:")
print("hi from string one")
print('hi from string two')

print("Type casting functions:")
print(bool(0))   # convert to boolean (True or False)
print(float(42)) # convert to a floating point number
print(int(2.8))  # convert to an integer (int)


#OPERATORS
#=============================================================================
#Arithmetic	+, -, *, /, //, **, %
#Relational	<, <=, >=, >, ==, !=

print(3 * 2)
print(3 * "abc")
print(3 + 2)
print("abc" + "def")
print(3 + "def")

print("Integer division:")
print(" 5/3  =", ( 5/3))
print("Float division:")
print(" 5.0/3 =", ( 5.0/3))
print(" 5/3.0 =", ( 5/3.0))

print(" 6%3 =", ( 6%3))
print(" 5%3 =", ( 5%3))
print(" 2%3 =", ( 2%3))
print(" 0%3 =", ( 0%3))
print(" 3%0 =", ( 3%0))

print("String operators:")
print("hello " + "world!")
print("hello " * 3)

#PITFALLS
#=============================================================================
print("The problem....")
d1 = 0.1 + 0.1 + 0.1
d2 = 0.3
print(d1 == d2)                # False (never use == with floats!)


#CLASS PROBLEMS
#=============================================================================
print(type("0.01"))
print("hello " + 0 )
print("1" + "2")

print(3/5)
print(3./5)


#*supplementary exercise* negative-mod
print("-4%3 =", (-4%3))
print("4%-3 =", (4%-3))