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Learn with Ray

DAY 1:

 

print("Hello")
print('how are you today?')
print(5+4)
print('5+4')
print('5+4=',5+4,'and 6+4=',6+4)
var_1 = 5 #datatype is implicit
print(var_1+10)
#variable naming rule: It shouldnt start with a number, only _ is a allowerd special character
var_1 = 15
print(var_1+10)
#comments are for human
#print() - functions are written to perform certain task

#interpreter (Python R) or compiler (C C++ Java...)

# 5 basic datatypes:
## int - integer - numeric values without decimal part: -999, -99, 0,1,2,99
## float - float - numeric values with decimal part: -5.5, 5.0, 0.0
## complex - complex - numeric values that represent square root of minus 1 (i)
## str - string - text data
## bool - boolean - just two values: True / False

var_1 = 5j
print(var_1 * var_1) #25*-1= -25
print(type(var_1))

#operators & operation
#Arithmetic operators: + - * / // (integer division) ** % (modulus - mod)
num1 = 7
num2 = 3
print(num1/num2)
print(50 // 6)
print(num1 ** num2)
print(50 % 6)

#Comparison operators: == > >= < <= != Will always result in bool values
num1 = 10
num2 = 10
num3 = 15
print(num1 == num2) #is num1 equal to num2 ? True
print(num1 != num3) #is num1 not equal to num2? True
print(num1 > num2) # False
print(num1 >= num2) #True
print(num1 < num2) # False
print(num1 <= num2) #True

#Logical operators = and / or = they work only on boolean value and given bool as result
#prediction1: Argentina and France will play in the Soccar world cup final - True
#prediction2: Argentina or Brazil will play in the Soccar world cup final- True
#actual: Argentina and France actually played in the finals

#and truth table:
# True and True = True
# False and False = False and True = True and False = False

#or truth table:
# False or False = False
# True or True= False or True = True or False = True

a,b,c=5, 10,10
print(a > b and b<c and c==a or c==b or a>c and c<a and b==b and c<a or c==b)

#Conditions
# I want to check if a number is positive or not
num1 = 0
if num1 >0:
print("Number is positive")
print("Line 2 for positive")
elif num1<0:
print("Number is negative")
print("Line 2 for negative")
else:
print("Number is neither positive nor negative")
print("Thank you")


#conditions
#if - elif - else
###
# When +ve: case 1 = 3 , case 2 =3
# When -ve: case 1 = 3 , case 2 =2
# When 0: case 1 = 3 , case 2 = 1
##
num = -50

#case 1
if num==0:
print("Its Zero")
if num <0:
print("Its negative")
if num >0:
print("Its positive")

#case 2
if num==0:
print("Its Zero")
elif num <0:
print("Its negative")
else:
print("Its positive")
#converting one datatype to another - str(), int(),float(),complex(),bool()
marks_in_subject1 = int(input("Enter marks in Subject 1:"))

print(type(marks_in_subject1))
marks_in_subject2 = 8.0
marks_in_subject3 = 88
marks_in_subject4 = 8
marks_in_subject5 = 8
total = marks_in_subject1 + marks_in_subject2 + marks_in_subject3+marks_in_subject4+marks_in_subject5
avg = total/5
print("Average = ",avg)
#avg > 85 - A
# avg>70 - B
# avg > 60 - C
#avg >50 - D
#avg >40 - E
#avg < 40 - F
#avg >=90 - special award
if avg >=85:
print("You got grade A")
if avg>=90:
print("You win Special award")
if avg>=95:
print("You get a Scholarship")
elif avg >=70:
print("You got grade B")
elif avg>=60:
print("You got grade C")
elif avg>=50:
print("You got grade D")
elif avg>=40:
print("You got grade E")
else:
print("You got grade F")


print("Thank You")

#nested

#LOOPS - Repeat
print("Hello")
# Loops - For loop and While loop
#For loop is used when you know how many times you need to repeat
#While loop is used when you dont know exactly how many times but you know the condition
#when to stop

#print hello 5 times
# range(a,b,c) : a=start (inclusive), b = end (exclusive), c=increment
# range(2,8,3) : 2,5
# range(a,b) : a=start, b=end, default increment = 1
# range(2,5) : 2,3,4
# range(b): default start = 0, end=b, default increment of 1
# range(5): 0,1,2,3,4
print("For loop 1:")
for var in range(5):
#print("Value of var is ",var)
print("Hello")

print("Using while: ")

counter = 1
while counter <=5:
counter = counter + 1
print("Hello")
print("Thank You")

DAY 3:

 

#Day 3: Loops
#For loop - along with range() , how many times the loop has to run

for i in range(1,101):
print(i,end="\t")
print()
print("Hello")
#by default print will give us a newline

n,m=5,6
for j in range(m):
for i in range(n):
print("*",end=" ")
print()
'''
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *
'''

n=5
for j in range(n):
for i in range(j+1):
print("*",end=" ")
print()
'''
*
* *
* * *
* * * *
* * * * *
'''

n=5
for j in range(n):
for i in range(n-j):
print("*",end=" ")
print()
'''
* * * * *
* * * *
* * *
* *
*
'''
print("-----")
for j in range(n):
for k in range(n-j-1):
print(" ",end="")
for i in range(j+1):
print("*",end=" ")
print()
'''
*
* *
* * *
* * * *
* * * * *
'''
# check if a number is prime or not
number = 51
# 51 - 1, 51
isPrime = True
for i in range(2,number//2):
if number%i==0:
isPrime=False
break
#break will throw you out of current loop

if isPrime:
print("Number is prime")
else:
print("Number is not Prime")


total = 0
for i in range(1,101):
total=total+i
print("\n total is ",total)

#1: total= 0 + 1 = 1
#2: total = 1 + 2 = 3
#3: total = 3 + 3 = 6

#While
while True:
print("Hello")
if True:
break

import random
random.seed(10)
num = random.random() #generates random number between 0 and 1
print("num = ",num)
num1 = random.randint(1,10) # integer values - between 1 and 10 (both inclusive)
print("num1 = ",num1)
attempts = 0
actual = 45 #random.randint(1,100)
while True:
guess = int(input("Enter your guess number:"))
attempts=attempts+1
if actual == guess:
print(f"Congratulations! You have guessed it correctly in {attempts} attempts")
break
elif actual < guess:
print("You missed it! Your Guess is higher")
else: #actual >guess
print("You missed it! Your Guess is lower")
#Strings
var1 = 'hello'
print(type(var1))
var2 = "good morning"
print(type(var2))
var3 = '''Hi there
where are you going
I am here till you come'''
print(type(var3))
var4 ="""Hows going
I was waiting to talk to you
see you soon"""
print(type(var4))
print(var3)
print(var4)

# What's your name?
var5 = "What's your name?"
print(var5)

# He asked,"How are you"?
print('He asked,"How are you"?')

# He asked,"What's your name"?
print('''He asked,"What's your name"?''')
print("He asked,\"What\'s your name\"?")
var1 = 'hello'
print('H' in var1)
for i in var1:
print(i)
# 'y' 'a' "yes" "no" "name"

# ' or " can only take one line of text
#''' or """ can take multi line text

# [] square brackets are used for indexing
print("=====> 1. ",var1[4])
print("=====> 1. ",var1[-1])
print("=====> 2. ",var1[0:4])
print("=====> 3. ",var1[:4])
print("=====> 3. ",var1[-5:-1])
print("=====> 3. ",var1[:-1])
print("=====> 4. ",var1[-3:])

#len()
print("Length = ",len(var1))

for i in range(len(var1)):
print(var1[i])

var1 = "hello"
var2 = "Good Morning"
print(var1,var2)
print(var1 + " and "+(var2+ " ")*3)
#Strings
str1 = "hellothere" #str1 is an object of class str
str2 = "49534095834"
print("str2.isdigit(): ",str2.isdigit())
print("str1.isdigit(): ",str1.isdigit())
print("str1.isalpha()",str1.isalpha())
print(" ".isspace())
str1.isalnum()
str1 = "hello there 123"
print("str1.islower(): ",str1.islower())
str1.isupper()
str1.istitle()

ch=input("Enter Y to continue: ")

#username - username can have only alphabet and/or number

#first name - ABC XYZ

#methods (function in a class) v functions -independent

num1 = input("Enter a number: ")
if num1.isdigit():
num1=int(num1)
else:
print("You have not entered a valid number hence setting num1 to zero")
num1 = 0
print("num1 = ",num1)

# Exception Handling - to handle runtime errors - preferred

str1 = "HELLO"
#strings are immutable
print(str1[0])
#str1[0] = "K" #TypeError: 'str' object does not support item assignment
#str1 = "KELLO"
str1 = "K"+str1[1:]
print(str1)

str2="How are YOU? your Where are you? you are welcome"
str3 = str2.lower().replace("you","they",2) #old,new,count
print("After Replace: ",str3)
print("you" in str2)
print(str2.lower().find("you",9)) #find: substring, start, end

var1 = str2.split("o")
print(var1)
str5 = "o".join(var1)
print(str5)

#abc => abcing
#abing = abingly
inp_txt = input("Enter the word: ")
output=""
if inp_txt[-3:].lower()=="ing":
output= inp_txt+"ly"
else:
output = inp_txt+"ing"
print("Output text is",output)


str1 = "How are you doing today and whats plan for tomorrow"
l_str = ""
curr_str = ""
inx = 0
for c in str1:
inx+=1
if inx==len(str1):
curr_str = curr_str + c
if c.isspace() or inx==len(str1):
if len(curr_str) > len(l_str):
l_str=curr_str
curr_str=""
else:
curr_str=curr_str+c

print("Largest text is",l_str)

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