1.6. Basic Python Practices

Python Syntax

• Insert the missing part of the code below to output "Hello World".

print("Hello World")

• Comments in Python are written with a special character, which one?

#This is a comment

Python Variables

• Create a variable named carname and assign the value Volvo to it.

Carname = "Volvo"

• Create a variable named x and assign the value 50 to it.

x = 50

• Display the sum of 5 + 10, using two variables: x and y.

x = 5

y = 10

print(x + y)

• Create a variable called z, assign x + y to it, and display the result.

z = x + y

print(z)

Python Strings

• Use the len method to print the length of the string.

x = "Hello World"

print(len(x))

• Get the first character of the string txt.

txt = "Hello World"

txt[0]

• Get the characters from position 2 to position 5 (not included).

txt = "Hello World"

txt[2:5]

• Return the string without any whitespace at the beginning or the end.

txt = "Hello World"

x = txt.strip()

• Convert the value of txt to uppercase.

txt = "Hello World"

txt = txt.upper()

• Convert the value of txt to lowercase.

txt = "Hello World"

txt = txt.lower()

• Replace the character H with a J.

txt = "Hello World

txt = txt.replace("H", "J")

Python Operators

• Multiply 10 with 5, and print the result.

print(10 * 5)

• Divide 10 by 2, and print the result.

print(10 / 2)

• Use the correct membership operator to check if "apple" is present in the fruits object.

fruits = ["apple", "banana"]

if "apple" in fruits:

print("apple is in the fruits")

• Use the correct comparison operator to check if 5 is not equal to 10.

if 5 != 10:

print("5 is not equal to 10")

• Use the correct logical operator to check if at least one of two statements is True.

if 5 == 10 or 4 ==4:

print("At leat one of two statements is True")

Python Lists

• Print the second item in the fruits list.

fruits = ["apple", "banana", "cherry"]

print(fruits[1])

• Change the value from "apple" to "kiwi", in the fruits list.

fruits = ["apple", "banana", "cherry"]

fruits[0] = "kiwi"

• Use the append method to add "orange" to the fruits list.

*append is to join or add on to the end of something

fruits = ["apple", "banana", "cherry"]

fruits.append("orange")

• Use the insert method to add "lemon" as the second item in the fruits list.

fruits = ["apple", "banana", "cherry"]

fruits.insert(1, "lemon")

• Use the remove method to remove "banana" from the fruits list.

fruits = ["apple", "banana", "cherry"]

fruits.remove("banana")

Python Tuples

• Print the first item in the fruits tuple.

fruits = ("apple", "banana", "cherry")

print(fruits[0])

• Print the number of items in the fruits tuple.

fruits = ("apple", "banana", "cherry")

print(len(fruits))

Python Sets

• Check if "apple" is present in the fruits set.

fruits = {"apple", "banana", "cherry"}

if ("apple" in fruits):

print("Apple is in the fruits set")

• Use the add method to add "orange" to the fruits set.

fruits = {"apple", "banana", "cherry"}

fruit.add("orange")

• Use the correct method to add multiple items (more_fruits) to the fruits set.

fruits = {"apple", "banana", "cherry"}

more_fruits = ["orange", "mango", "grapes"]

fruits.update(more_fruits)

• Use the remove method to remove "banana" from the fruits set.

fruits = {"apple", "banana", "cherry"}

fruits.remove("banana")

• Use the discard method to remove "banana" from the fruits set.

fruits = {"apple", "banana", "cherry"}

fruits.discard("banana")

Python Dictionaries

• Use the get method to print the value of the "model" key of the car dictionary.

car = {

"brand": "Ford",

"model": "Mustang",

"year": 1964

}

print(car.get("model"))

• Change the "year" value from 1964 to 2018.

car = {

"brand": "Ford",

"model": "Mustang",

"year": 1964

}

car["year"] = 2018

• Add the key/value pair "color" : "red" to the car dictionary.

car = {

"brand": "Ford",

"model": "Mustang",

"year": 1964

}

car["color"] = "red"

• Use the pop method to remove "model" from the car dictionary.

car = {

"brand": "Ford",

"model": "Mustang",

"year": 1964

}

car.pop("model")

• Use the clear method to empty the car dictionary.

car = {

"brand": "Ford",

"model": "Mustang",

"year": 1964

}

car.clear()

Python If / Else

• Print "Hello World" if a is greater than b.

a = 50

b = 10

if a > b:

print("Hello World")

• Print "Hello World" if a is not equal to b.

a = 50

b = 10

if a != b:

print("Hello World")

• Print "Yes" if a is equal to b, otherwise print "No".

a = 50

b = 10

if a == b:

print("Yes")

else:

print("No")

• Print "1" if a is equal to b, print "2" if a is greater than b, otherwise print "3".

a = 50

b = 10

if a == b:

print("1")

elif a>b:

print("2")

else:

print("3")

• Print "Hello" if a is equal to b, and c is equal to d.

if a == b and c == d:

print("Hello")

• Print "Hello" if either a is equal to b, or c is equal to d.

if a == b or c == d:

print("Hello")

Python Loops

• Print i as long as i is less than 6.

i = 6

while i < 6:

print (i)

i += 1

• Stop the loop if i is 3.

i = 1

while i < 6:

if i == 3:

break

i += 1

• Loop through the items in the fruits list.print(x)

fruits = ["apple", "banana", "cherry"]

for x in fruits:

print(x)

• In the loop, when the item value is "banana", jump directly to the next item.

fruits = ["apple", "banana", "cherry"]

for x in fruits:

if x == "banana":

continue

print(x)

• Use the range function to loop through a code set 6 times.

for x in range(6):

print(x)

Python Functions

• Create a function named my_function.

def my_function():

print("Hello, this is a function")

• Create a function named my_function.

def my_function():

print("Hello from a function")

my_function()

• Inside a function with two parameters, print the first parameter.

def my_function(fname, lname):

print(fname)

• Let the function return the x parameter + 5.

def my_function(x):

return x + 5

• Create a lambda function that takes one parameter (a) and returns it.

x = lambda a:a