pro2.py

# string concatination 
str1 = "adan"
str2= "it"
str3 = "center"
print(str1 +" " + str2 + " " + str3)
print(len(str1))
print(len(str1+str2+str3))

#indexs
stri = "python is best"
print(stri[0])
print(stri[1])
print(stri[2])
print(stri[3])
print(stri[4])
print(stri[5])

# slicing
print(stri[0:4])
print(stri[7:9])
print(stri[:9])
print(stri[4:len(stri)])


# string functions
print(stri.upper())
print(stri.lower())
print(stri.title())
print(stri.count("t"))
print(stri.capitalize())
print(stri.find("best"))
print(stri.replace("best", "good"))
print(stri.endswith("best"))

#  pracice 
p= input("enter a string: ")
print(len(p))
print(p.upper())
print(p.lower())
print(p.count("a"))


#conditional or is statments
marks=int (input("enter your marks: "))
if(marks>=90):
    print("grade A")
elif(marks>=80):
    print("grade B")
elif(marks>=70):
    print("grade C")
elif(marks>=60):
    print("grade D")
else:
    print("grade F")


#practice greatest number
a = int(input("Enter first number: "))
b = int(input("Enter second number: "))
c = int(input("Enter third number: "))
if(a>b and a>c):
    print("the greatest number is: ", a)
elif(b>a and b>c):
    print("the greatest number is: ", b)
else:   
    print("the greatest number is: ", c)