print("Hello world!")

print("Hello", "world!")

x=5
y=-3
print(x, type(x))
print(y, type(y))

x = 5.5
print(type(x))

x=5.0
y=-3.2
z=2.2e6
print(x, type(x))
print(z, type(z))

x = "CS1001.py"
y = 'I love python'
print(x, type(x))
print(y, type(y))

print(type(4), type(4.0), type("4"))

i_love_python = True
python_loves_me = False
print(i_love_python, type(i_love_python))
print(python_loves_me, type(python_loves_me))

4 + 5

x = 5
4 + x

x = 4.0 + 5
print(x, type(x))

x - 3

x * 3

10 / 3, 10 // 3

2 ** 3, 2 ** 3.0, 3 ** 2

10 % 3

"Hello" + " World"

"Bye" * 2

4 + 5

"4" + "5"

"4" + 5

4 + "5"

5 < 4

5 > 4

5 >= 4

4 >= 4

4 <= 3

5 == 4

5 == 5.0

5 == "5"

5 != 4

2 + 2 == 4

2 => 3

x = 1 / 3 
print(x)
x == 0.3333333333333333

print(not True)
a = 2 == 5
print(not a)

True and True

True and False

False and False

True or True

True or False

x = "6"
print(x, type(x))
x = int("6")
print(x, type(x))

float("1.25")

str(4)

int("a")

course = "intro" + str(2) + "cs"
print(course)
print("intro", 2, "cs", sep='')

today = "Monday"
strike = "N"
my_recitation = "Monday"

if today == "Sunday":
    print("Shvizut Yom Alef")
    if strike == "Y":
        print("Stay home")
    else:
        print("Lecture in intro to CS!")
elif today == "Wednesday":
    print("Another lecture in intro to CS!")
elif today == my_recitation:
    print("Go to recitation!")
elif today == "Monday" or today == "Tuesday" or today == "Thursday" or \
                    today == "Friday" or today == "Saturday":
    print("no intro to CS")
else:
    print("Not a day")

num = 2**100
print(num)

count = 0

while num > 0:   #what if we changed to >=0?
    if num % 10 == 0:
        count = count + 1
    num = num // 10

print(count)

num = 2**100
count = 0
for digit in str(num):
    #print(digit, type(digit))
    if digit == "0":
        count = count + 1

print(count)

num = 2**100
count = str.count(str(num), "0")

print(count)

%%timeit
num = 2**100
count = 0
while num>0:   #what if we changed to >=0?
    if num % 10 == 0:
        count = count + 1
    num = num // 10

%%timeit 
num = 2**100
count = 0
for digit in str(num):
    if digit == "0":
        count = count + 1

%%timeit 
num = 2**100
count = str.count(str(num), "0")