Welcome to my documentation for the Coursera specialization "Programming for Everybody"
course info: https://online.umich.edu/series/python-for-everybody/
#3.3 A program that converts scores to grades
score = float(input("Enter Score: "))
if score >= 0.9:
print("A")
elif score >= 0.8:
print("B")
elif score >= 0.7:
print("C")
elif score >= 0.6:
print("D")
elif score < 0.6:
print("F")
else:
print("this score is out of range")
#4.6 A program that computes gross pay
hours = float(input("how many hours did you work?"))
rate = float(input("what is your rate of pay?"))
def computepay(h, r):
if h > 40:
overtime_rate = r * 1.5
extra_hours = h - 40
normal_hours = h - extra_hours
pay = (overtime_rate * extra_hours) + (normal_hours * r)
print("Pay", pay)
else:
print("Pay", h * r)
return
computepay(hours, rate)
#5.2 A program that prints the largest of numbers entered
largest = None
smallest = None
while True:
num = input("Enter a number: ")
if num.lower() == "done":
print("Maximum is", largest)
print("Minimum is", smallest)
break
try:
num = int(num)
largest = num if largest is None or num > largest else largest
smallest = num if smallest is None or num < smallest else smallest
except ValueError:
print("Invalid input")
#6.5 A program that reads a file and extracts numbers from it
*uses mbox-short.txt*
text = "X-DSPAM-Confidence: 0.8475"
start = text.find("0")
end = text.find("5")
print(float(text[23:29]))#7.1 A program that reads a file and then prints the file in uppercase
*uses words.txt*
fname = input("Enter file name: ")
fh = open(fname)
for line in fh:
print((line.upper()).strip())#7.2 A program that averages a set of numbers it finds in a file
*uses mbox-short.txt*
fname = input("Enter file name: ")
fh = open(fname)
x = 0
value = 0
for line in fh:
if not line.startswith("X-DSPAM-Confidence:"):
continue
else:
x = x + 1
value = value + float(line[20:26])
average = value / x
print("Average spam confidence:", average)#8.4 A program that takes all of the unique words in a file and prints them out in alphabetical order
*uses romeo.txt*
fname = input("Enter file name: ")
fh = open(fname)
list = list()
for line in fh:
lines = line.split()
for word in lines:
if word not in list:
list.append(word)
list.sort()
print(list)#8.5 A program that opens a file and counts the number of times a line begins with a specific word
*uses mbox-short.txt*
fname = input("Enter file name: ")
if len(fname) < 1:
fname = "mbox-short.txt"
fh = open(fname)
count = 0
for line in fh:
if line.startswith("From "):
new_line = line.split()
print(new_line[1])
count = count + 1
print("There were", count, "lines in the file with From as the first word")
#9.4 A program that calculates the most prolific email sender based on data from a file
*uses mbox-short.txt*
name = input("Enter file:")
if len(name) < 1:
name = "mbox-short.txt"
file = open(name)
dictionary = {}
emails = []
big_number = 0
big_word = None
count = 0
for line in file:
if line.startswith("From "):
lines_of_from = line.split()
emails.append(lines_of_from[1])
for email in emails:
dictionary[email] = dictionary.get(email, 0) + 1
for key in dictionary:
if dictionary[key] > big_number or big_number == None:
big_number = dictionary[key]
big_word = key
print(big_word, big_number)
#10.2 A program that counts the number of times an email was sent per hour of the day
*uses mbox-short.txt*
name = input("Enter file:")
if len(name) < 1:
name = "mbox-short.txt"
file = open(name)
times = []
hours = []
dictionary_of_hours = {}
for line in file:
if line.startswith("From "):
from_lines = line.split()
times.append(from_lines[5])
for time in times:
hhmmss = time.split(":")
hours.append(hhmmss[0])
hours.sort()
for hour in hours:
dictionary_of_hours[hour] = dictionary_of_hours.get(hour, 0) + 1
for key, value in dictionary_of_hours.items():
print(key, value)
#11.2 A program that finds the sum of all numbers in a file
*uses sample.txt*
import re
input_file = input("file name: ")
file = open(input_file)
numbers = []
count = 0
for line in file:
x = re.findall("[0-9]+", line)
for index in x:
y = re.findall("[0-9]+", index)
count = count + int(y[0])
print(count)
#12.5 A program that finds the sum of all numbers in the span tags within a file
*uses http://py4e-data.dr-chuck.net/comments_42.html or "http://py4e-data.dr-chuck.net/comments_2014612.html"*
from urllib.request import urlopen
from bs4 import BeautifulSoup
import ssl
count = 0
# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
url = input('Enter - ')
html = urlopen(url, context=ctx).read()
soup = BeautifulSoup(html, "html.parser")
# Retrieve all of the span tags
tags = soup('span')
for tag in tags:
print('Contents:', tag.contents[0])
count=count+int(tag.contents[0])
print(count)
#12.6 A program that follows a link at x position, x number of times
*uses http://py4e-data.dr-chuck.net/known_by_Shayan.html or "http://py4e-data.dr-chuck.net/known_by_Fikret.html"*
import urllib.request, urllib.parse, urllib.error
from bs4 import BeautifulSoup
import ssl
import re
# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
urls = []
url = input("Enter URL: ")
count = input("Enter count: ")
try:
count = int(count)
except:
print("please enter a number")
count = int(input("Enter count: "))
position = input("Enter position: ")
try:
position = int(position)-1
except:
print("please enter a number")
position = int(input("Enter position: "))
print("Retrieving: ", url)
for number in range(count):
html = urllib.request.urlopen(url, context=ctx).read()
soup = BeautifulSoup(html, 'html.parser')
tags = soup('a')
url = tags[position].get('href', None)
print("Retrieving: ", url)