Change ide

ch03-first-python-program/hello_world.py

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+# This is a block comment
+greeting = "Hello, World"  # this is an inline comment
+greeting
+
+# Multiline may help a
+# comment for clarity

ch04-strings-and-string-methods/string-and-numbers.py

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+# convert input (string) to numer
+
+num = input("Enter a number to be doubled: ")
+doubled_num = num * 2
+print(doubled_num)
+
+
+
+num = input("Enter a number to be doubled: ")
+doubled_num = int(num) * 2
+print(doubled_num)
+
+
+# Review exercises
+
+num_string = "5"
+num_int = int(num_string)
+print("String to int and multiplied is " + num_string)
+print(num_int *2)
+
+
+num_float = float(num_string)
+print("Float from string multiplied by 3.5")
+print(num_float * 3.5)
+
+
+# string and integer object in print statment
+
+text = "Hello"
+num = 42
+print(text + " " + str(num))
+
+# 2 inputs are calculated and written
+
+print("Please enter two numbers to multiply")
+prompt = "Number 1: "
+input1 = input(prompt)
+prompt = "Number 2: "
+input2 = input(prompt)
+result = float(input1) * float(input2)
+print(result)
+print("The product of " + input1 + " and " + input2 + " is " + str(result) + ".")
+
+# streamline your prints
+
+name = "Zaphod"
+heads = 2
+arms = 3
+
+# starting from python 3.6
+print(name + " has " + str(heads) + " heads and " + str(arms) + " arms.")
+
+# earlier versions use .format()
+print("{} has {} heads and {} arms.".format(name, heads, arms))
+
+
+# formatted strings
+print(f"{name} has {heads} heads and {arms} arms.")
+
+n = 3
+m = 4
+print(f"{n} times {m} is {n*m}")
+
+
+# Review exercise
+
+weight = 0.2
+animal = "newt"
+
+print( str(weight) + " kg is the weight of the " + animal)
+
+print("{} kg is the weight of the {}".format(weight, animal))
+
+print(f"{weight} kg is the weight of the {animal}")

ch04-strings-and-string-methods/string-challenge-pick-apart.py

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+'''4.5. Challenge: Pick Apart Your User’s Input
+4.5 Challenge: Pick Apart Your User’s
+Input
+Write a program named first_letter.py that prompts the user for in-
+put with the string "Tell me your password:". The program should then
+determine the first letter of the user’s input, convert that letter to up-
+percase, and display it back.
+For example, if the user input is "no", then the program should display
+the following output
+The first letter you entered was: N'''
+
+prompt = "Tell me your password: "
+user_input = input(prompt)
+print("The first letter you entered was: " + user_input[:1].upper())

ch04-strings-and-string-methods/string-concatenation-indexint-slicing.py

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+# Concatenation
+string1 = "abra"
+string2 = "cadabra"
+magic_string = string1 + string2
+print(magic_string)
+
+first_name = "Arthur"
+last_name = "Dent"
+full_name = first_name + " " + last_name
+print(full_name)
+
+# Indexing
+flavor = "fig pie"
+print("Get character at index 1 of " + flavor )
+print(flavor[1])
+
+# get last character
+print("Get last charakter")
+print(flavor[-1])
+
+# substring
+flavor_substring = flavor[0:3]
+print("Substring 0:3 of flavor")
+print(flavor_substring)
+
+# substring from 3 till end
+flavor_end = flavor[3:]
+print(flavor_end)
+
+# no IndexError if I try to slice between boundaries outside the beginning or
+# ending of a string
+print("End of substring is outside the index range")
+print(flavor[:14])
+
+print("Start and End are outside the strings lenght")
+print(flavor[13:15])
+
+# strings are immutable meaning characters cannot be changed
+# changes require new string assignments
+word = "goal"
+print("Initial word " + word)
+word = "f" + word[1:]
+print("Result after concatenation of f plus word[1:]")
+print(word)
+
+# exercise
+test = "bazinga"
+print(test[2:6])

ch04-strings-and-string-methods/string-find.py

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+# use .find() which returns the index of the start of the substring
+
+phrase = "the surprise is in here somewhere"
+to_find = "surprise"
+print("Looking for " + to_find)
+print(phrase.find("surprise"))
+to_find = "eyjafjallajökull"
+
+# find() returns -1 if not found
+print("Now looking for " + to_find)
+print(phrase.find("eyjafjallajökull"))
+
+# find() is casesensitve and all characters must match
+print(phrase.find("SURPRISE"))
+
+# find() returns only the start indext of the first occurance
+msg = "I put a string in your string"
+print(msg)
+print(msg.find("string"))
+
+# numbers in string
+text = "My number is 555-555-5555"
+print(text)
+# will cause TypeError
+# print("Find 5")
+#print(text.find(5))
+print("Find '5'")
+print(text.find("5"))
+
+
+# replace
+my_story = "I'm telling you the truth; nothing but the truth!"
+print("Original: " + my_story)
+print("replaced: " + my_story.replace("the truth", "lies"))
+print("Call variable again to see it unaltered: " + my_story)
+my_story = my_story.replace("the truth", "lies")
+print("Finally: " + my_story)
+
+# to replace various words
+sample = "some of the stuff"
+print("Go from: " + sample)
+new_sample = sample.replace("some of", "all")
+new_sample = new_sample.replace("stuff", "things")
+print("To: " + new_sample)
+
+# Review exercises
+print("AAA".find("a"))
+
+exercise2 = "Somebody said something to Samantha."
+result2 = exercise2.replace("s", "x")
+print(result2)
+
+exercise3 = "Please give me a word: "
+input_from_user = input(exercise3)
+print(input_from_user.find("b"))
+

ch04-strings-and-string-methods/string-interact-with-user.py

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+# get input
+
+input()
+
+prompt = "Hey, what's up? "
+user_input = input(prompt)
+print("You said: " + user_input)
+
+
+# do something with the user input
+
+response = input("What should I shout? ")
+shouted_response = response.upper()
+print("Well, if you insist..." + shouted_response)
+
+
+# exercise
+question = "What is your favourite colour? "
+answer = input(question)
+print(answer)
+
+answer_lower = input(question).lower()
+print(answer_lower)
+
+print("Number of characters in your favorite colour is: ")
+print(len(answer_lower))
+
+

ch04-strings-and-string-methods/string-manipulate-with-methods.py

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+# converting string case
+
+name1 = "Jean-Luc Picard".lower()
+print(name1)
+
+name2 = "Jean-Luc Picard"
+print(name2.lower())
+
+print(name1.upper())
+
+print("Length of the variable ")
+print(len(name1))
+
+'''
+Remove whitespace three string methods
+.rstrip()
+.lstrip()
+.strip()
+'''
+
+name1 = """Jean-Luc Picard       """
+print("Input with whitespace")
+print(name1)
+print(len(name1))
+
+print("\nInput without whitespace")
+print(name1.rstrip())
+print(len(name1.rstrip()))
+
+
+
+
+name1 = """     Jean-Luc Picard"""
+print("Input with whitespace")
+print(name1)
+print(len(name1))
+
+print("\nInput without whitespace")
+print(name1.lstrip())
+print(len(name1.lstrip()))
+
+
+name1 = """     Jean-Luc Picard       """
+print("Input with whitespace")
+print(name1)
+print(len(name1))
+
+print("\nInput without whitespace")
+print(name1.strip())
+print(len(name1.strip()))
+
+'''
+.startswith()
+.endswith()
+'''
+print("\nstartswith and endswith")
+starship = "Enterprise"
+print("Does starship '" + starship + "' start with 'en'?")
+print(starship.startswith("en"))
+
+print("Does starship '" + starship + "' start with 'En'?")
+print(starship.startswith("En"))
+
+print("Does starship '" + starship + "' end with 'risE'?")
+print(starship.endswith("risE"))
+
+
+print("""\nUpper and lower do not change the string.
+    The return a copy""")
+
+
+name = "Picard"
+print(name.upper())
+print(name)
+
+print("To keep the change you need to assign it to the variable")
+name = name.upper()
+print("Result after name = name.upper()")
+print(name)
+
+
+
+# exercise
+
+print("Animal".lower())
+print("Badger".lower())
+bee = "Honey Bee"
+print(bee.lower())
+print("Honey Badger".lower())
+
+animal = "Animal"
+badger = "Badger"
+bee = "Honey Bee"
+honey_badger = "Honey Badger"
+print(animal.upper())
+print(badger.upper())
+print(bee.upper())
+print(honey_badger.upper())
+
+
+# exercise remove whitespace
+
+string1 = " Filet Mignon"
+string2 = "Brisket "
+string3 = " Cheeseburger "
+
+string1 = string1.lstrip()
+string2 = string2.rstrip()
+string3 = string3.strip()
+
+print(string1)
+print(string2)
+print(string3)
+
+startwith_string1 = "Becomes"
+startwith_string2 = "becomes"
+startwith_string3 = "BEAR"
+startwith_string4 = "    bEautiful"
+
+print(startwith_string1.startswith("be"))
+print(startwith_string2.startswith("be"))
+print(startwith_string3.startswith("be"))
+print(startwith_string4.startswith("be"))
+
+startwith_string1 = startwith_string1.lower()
+startwith_string3 = startwith_string3.lower()
+startwith_string4 = startwith_string4.lstrip().lower()
+
+print(startwith_string1.startswith("be"))
+print(startwith_string2.startswith("be"))
+print(startwith_string3.startswith("be"))
+print(startwith_string4.startswith("be"))
+

ch04-strings-and-string-methods/string_stuff.py

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+string1 = 'Hello, World'
+string2 = "1234"
+string3 = "We're #1"
+string4 = 'I said, "Put it over by the llama."'
+text = "She said, \"What time is it?\""
+long_string = "This multiline string is \
+displayed on one line"
+print(long_string)
+
+paragraph = "This planet has—or rather had—a problem, which was \
+this: most of the people living on it were unhappy for pretty much \
+of the time. Many solutions were suggested for this problem, but \
+most of these were largely concerned with the movements of small \
+green pieces of paper, which is odd because on the whole it wasn't \
+the small green pieces of paper that were unhappy."
+print("\nLong paragraph one quote at begin and end\n")
+print(paragraph)
+
+# Triple quoted string preserve whitespace, including newlines
+paragraph = """This planet has—or rather had—a problem, which was
+this: most of the people living on it were unhappy for pretty much
+of the time. Many solutions were suggested for this problem, but
+most of these were largely concerned with the movements of small
+green pieces of paper, which is odd because on the whole it wasn't
+the small green pieces of paper that were unhappy."""
+print("\nNew string called paragraph")
+print(paragraph)
+
+print("""An example of a
+...    string that spans across multiple lines
+...        and also preseves whitespace.""")