DEV Community

dongdiri
dongdiri

Posted on

DAY1: Python day 1&2

#100daysofcode #python

Today, I start my programming journey. I will study on Thursdays, Fridays, and weekends every week, documenting what I've learned along the way.
I will start with a Udemy 100-day Python course and a Harvard CS50 course.
Hope I can get this through.

GETTING STARTED ON PYTHON

print() function

  • output something you put in the parenthesis.

  • for String, quotation marks needed around the argument.

String manipulation

\n within the quotation.

  • can combine Strings by using + sign.

  • when combined, there is no space in between; there are three ways to add it.

input() function

  • inside the parenthesis, we add a prompt for the user to answer.

  • the code gets replaced with the user input.

len() function

  • returns the number of characters in a String.

Python variables

  • variable helps to refer to a piece of data.

  • can later give a variable a different piece of data to hold onto.

  • in order to make code readable, try to name a variable in a way that makes sense.

  • can separate words in multiple ways:


myVariableName = "John" #Camel Case 
MyVariableName = "John" #Pascal Case
my_variable_name = "John" #Snake Case
Enter fullscreen mode Exit fullscreen mode

End of the lesson project: band name generator

#1. Create a greeting for your program.
print("Hello There")
#2. Ask the user for the city that they grew up in.
city = input("Which city did you grow up in?\n")
#3. Ask the user for the name of a pet.
pet_name = input("What is the name of your pet?\n")
#4. Combine the name of their city and pet and show them their band name.
print ("Your band name could be " + city + " " + pet_name + ".")
Enter fullscreen mode Exit fullscreen mode

Python Day2

I already knew these, so I decided to swiftly go through the second lesson as well.

String

  • subscripting: getting the position of the character in a String

  • you can put in a number starting from 0 in []to get the corresponding character.

  • as long as capped within a quote, numbers are also considered a String.

Integer

  • whole numbers.

  • to create an int, write the number without anything else.

  • large integers can be written with underscores (used like a comma), which will be automatically ignored.

Floating point number

  • a number with a decimal point

Boolean

  • True or False

type() function

  • checks type of data of something inside the bracket.

Type conversion

  • can use str(), int(), float() to convert data into another data type.

Mathematical operations

  • addition +

  • subtractions -

  • multiplications *

  • divisions /

  • exponent **

Rounding in Python

  • round(number, number of digits of precision) -floor division//; returns int value.

f-Strings

  • add f in front of the String

  • add in variables with different data types in {}

End of the lesson project: tip calculator

print("Welcome to the tip calculator.")
total = input("What was the total bill? $")
percentage = input("What percentage tip would you like to give? 10, 12, or 15? ")
people = input("How many people to split the bill? ")
tip = float(total)/int(people)*(1 + int(percentage)/100)
rounded_tip = round(tip, 2)
print(f"Each person should pay:${rounded_tip}")
Enter fullscreen mode Exit fullscreen mode

Top comments (1)

Collapse
 
anitaolsen profile image
Anita Olsen •

Good luck on your journey to learn Python! I have been learning Python for a while. If you happen to have any questions just ask and I will do my best to help!