Week 7 Notes

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# Python Problem Solver

# Week 7 Example 1: YOLO

#

line = input()

# Split input into a list of words in list2

list1 = line.split()

# list2 is used for output

list2 = []

for word in list1:

    # For each word in list1, append its 1st character to the end of list2

    list2.append(word[0])

# Join all the "1st characters" into 1 string and conver to upper case

print("".join(list2).upper())

# 

# Python Problem Solver

# Week 7 Example 2: Optical Illusions

#

from turtle import *

speed(10)

def drawCircle(x, y, r, c):

    penup()

    pencolor(c)

    fillcolor(c)

    goto(x, y - r)

    pendown()

    begin_fill()

    circle(r)

    end_fill()

    penup()

    hideturtle()

# Pay attention to all the coordinates are calcuated

drawCircle(-50, 0, 30, "purple")

drawCircle(-150, 0, 50, "black")

drawCircle(-50, 100, 50, "black")

drawCircle(50, 0, 50, "black")

drawCircle(-50, -100, 50, "black")

drawCircle(250, 0, 30, "purple")

drawCircle(310, 0, 10, "black")

drawCircle(250, -60, 10, "black")

drawCircle(190, 0, 10, "black")

drawCircle(250, 60, 10, "black")

input()

# 

# Python Problem Solver

# Week 7 Example 3: Calculating Pi

#

N = int(input())

sum = 0

for n in range(1, N+1):

    sum += 1/(n*n)

answer = (sum * 6) ** .5

print(f"The {N}-th approximation of Pi is {answer}")