- Description
- Hello World
- Print Shapes
- Variables
- Strings
- rendering literal characters
- printing a variable
- concatenation
- lowercase function
- uppercase function
- check string is uppercase or lowercase
- nesting functions
- string length
- indexing characters in a string
- return the first index of a character
- replace characters within a string
- strings to decimal value
- strings to integer value
- Numbers
- printing a number
- printing decimals
- printing negatives
- adding numbers
- subtracting numbers
- multiplying numbers
- dividing numbers
- remainders
- order of operations
- integer variables
- float variables
- converting numbers to string
- absolute value
- exponents
- maximum of multiple numbers
- minimum of multiple numbers
- rounding a decimal to integer
- importing more math functions
- rounding down a decimal value
- rounding up a decimal value
- square root
- Input
- Lists
- Tuples
- Functions
- If Statements
- Dictionaries
- While Loops
- For Loops
- 2D Lists
- Commenting
- Try and Except
- Classes and Objects
A review of basic python syntax based off of FreeCodeCamp's Youtube Tutorial. Within this repo, will mostly be code used during the tutorial. The format of this document will also follow similarly to the time stamps.
#generic hello world print statement
print("hello world")#generic triangle print statement
print(" /|")
print(" / |")
print(" / |")
print(" / |")
print("/____|")# with variables
character_age = "18"
character_name = "Van"
print("There was once a man named " + character_name + ", he was " + character_age)
# without variables
print("There was once a man named Van, he was 18")
# variable examples
string = "this is a string"
integer = 8
float_example = 2.0
boolean = True#rendering literal characters
print("this is a \"quote\" ")#printing a variable
variable = "text"
print(variable)#concatenation
statement = "string"
print("this is a " + statement)#lowercase function
lowercase_text = "THIS IS LOWERCASE"
print(lowercase_text.lower())#uppercase function
uppercase_text = "this is uppercase"
print(uppercase_text.upper())#check string is uppercase or lowercase
check = "is this uppercase"
print(check.isupper())
print(check.islower())#nesting functions, the code below is equivalent
item = "this is a item"
item_upper = item.upper()
print(item_upper.isupper())
print(item.upper().isupper())#string length
length = "what is this string length"
print(len(length))#indexing the first character
string_index = "index this string"
print(string_index[0])#return the first index of a character
index_string = "index this string"
print(index_string.index("d"))#replace characters within a string
replace_string = "replace this"
print(replace_string.replace("this", "that"))#strings to decimal value
print(float("5"))#strings to integer value
print(int("5"))#printing a number
print(2)#printing decimals
print(2.1189)#printing negatives
print(-2)#adding numbers
print(1 + 2)#subtracting numbers
print(2 - 1)#multiplying numbers
print(2 * 2)#dividing numbers
print(2 / 2)#remainders
print(10 % 3)#python follows order of operations
print(2 * 3 + 4 - 1)
print(2 * (3 + 4 - 1))#integer variables
my_int = 5#float variables
my_float = 5.0#converting numbers to string
print(str(5) + " is a number")#absolute value
print(abs(-5))#exponents, first integer is base and second is exponent
print(pow(3, 2))#maximum of multiple numbers
print(max(1, 2))#minimum of multiple numbers
print(min(1, 2))#rounding a decimal to integer
print(round(4.6))#importing more math functions
from math import *#rounding down a decimal value
print(floor(2.9))#rounding up a decimal value
print(ceil(2.1))#square root of a number as a decimal value
print(sqrt(9))#recieve input from user with a prompt, inputs are strings by defualt
input("this is your prompt: ")#storing input to a variable
name = input("what is your name? ")
age = input("what is your age? ")
print("hello " + name +"!" + " You are " + age + " years old!")#using math functions with input numbers
num_one = input("input first number: ")
num_two = input("input second number: ")
#accepts decimal numbers
result_float = float(num_one) + float(num_two)
#accepts only integers
result_int = int(num_one) + int(num_two)
print(result_float)
print(result_int)#concatenating input variables with mad libs
first = input("input first word: ")
second = input("input second word: ")
third = input("input third word: ")
print("Roses are " + first)
print(second + " are blue")
print("I love " + third)#declaring a list
list = ["item", 3, True]
print(list)#indexing the first item in a list, begins at 0
index_list = ["item", 3, True]
print(index_list[0])#indexing the first item from the back of a list, begins at -1
back_list = ["item", 3, True]
print(index_list[-1])#indexing a sublist within a list, second number is non-inclusive
sub_list = ["item", 3, True]
print(sub_list[1:3])
#indexing a sublist beginning at a certain index
sub_list2 = ["item", 3, True]
print(sub_list2[1:])#modifying an item in a list
modify_list = ["first", "second", "third", "fourth", "fifth"]
modify_list[1] = "change"
print(modify_list)#appending lists
first_list = [1, 2, 3]
second_list = [4, 5, 6]
first_list.extend(second_list)
print(first_list)#inserting an item into an index of the list
insert_list = [1, 2, 3, 4]
insert_list.insert(1, "insert")
print(insert_list)#remove last item in a list
pop_list = [1, 2, 3, 4]
pop_list.pop()
print(pop_list)#find index of an item in the list
find_list = [1, 2, 3, 4]
print(find_list.index(3))#count instances of item in list
count_list = [1, 1, 1, 2, 4]
print(count_list.count(1))#sorting a list
sort_list = [1, 2, 4, 7, 5, 9, 8]
sort_list.sort()
print(sort_list)#reversing a list
rev_list = [1, 2, 3, 4, 5]
rev_list.reverse()
print(rev_list)#copying a list
org_list = [1, 2, 3]
new_list = org_list.copy()
print(new_list)#declaring a tuple, tuples are immutable
coordinates = (4, 5)#indexing the first element in a tuple
index_tuple = (1, 2, 3, 4, 5)
print(index_tuple[0])#defining a function
def function():
print("this is my function")#defining a function with input parameters
def function_para(inputs):
print("this is my function wiht a parameter of " + inputs)#returning information from functions
def cube(num):
return (num * num * num)#declaring if statements
condition = True
if condition:
print("conditon is true")
else:
print("conditon is not true")#declaring or conditonals
is_male = True
is_tall = False
if is_male or is_tall:
print("they are male or tall or both")
else:
print("they are neither male nor tall")#declaring or conditonals
is_male = True
is_tall = False
if is_male or is_tall:
print("they are male or tall or both")
else:
print("they are neither male nor tall")#declaring and conditionals
is_smart = False
is_short = True
if is_smart and is_short:
print("you are smart and short")
else:
print("you are not smart and short")#declaring not conditionals
is_sick = False
if not(is_sick):
print("you are not sick")
else:
print("you are sick")#declaring comparisons
num1 = 1
num2 = 2
if num1 > num2:
print("num1 is greater than num2")
else:
print("num2 is greater than num1")#declaring a dictionary
dict = {
"key": "value",
"key2": "value2",
}#referencing keys in a dictionary
ref = {
"key": "value",
"three": 3,
"true": True,
}
print(ref["key"])
print(ref.get("key"))#specify a default value for invalid key references
spec = {
"key": "value",
"three": 3,
"true": True,
}
print(spec.get("key here", "default message here"))#declaring a while loop
condition = True
while condition:
print("this code will run as long acondition is true!")#declaring a for loop
list = ["item", "item", "item"]
for item in list:
print("this code will run for every item in the list!")#declaring a 2D list
list_2d = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]#indexing the first item within a 2D list
index_list = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
print(index_list[0][0])#iterate through each item in a 2D list
grid = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
for row in grid:
for col in row:
print(col)#comments in python will have the "#" written in front of them#declaring a try and accept block
try:
num = int(input("enter a string: "))
print(num)
except:
print("an error has occured!")#defining a class and object
class student:
def __init__(self, name, major, gpa):
self.name = name
self.major = major
self.gpa = gpa#using a class
class student:
def __init__(self, name, major, gpa):
self.name = name
self.major = major
self.gpa = gpa
Alex = student("Alex", "Computer Science", 3.1)#defining class functions
class student:
def __init__(self, name, major, gpa):
self.name = name
self.major = major
self.gpa = gpa
def on_honor_roll(self):
if self.gpa >= 3.5:
return True
else:
return False
Alex = student("Alex", "Computer Science", 3.1)
print(Alex.on_honor_roll())#inheriting class information
class student:
def __init__(self, name, major, gpa):
self.name = name
self.major = major
self.gpa = gpa
def on_honor_roll(self):
if self.gpa >= 3.5:
return True
else:
return False
class alumni(student):
def is_attending(self):
return False
Alex = alumni("Alex", "Computer Science", 3.1)
print(Alex.is_attending())