Python list

Shyamala Chandramohan — Tue, 29 Apr 2025 16:12:43 +0000

List 1:

concept 1:
check list and find the item no

packages = ["Letter", "Box", "Parcel"]
print(packages)
item=packages[1] #here the index 1 refers to item box.
print(item)

#Output
['Letter', 'Box', 'Parcel']
Box

Concept 2:

packages = ["Letter", "Box", "Parcel"]
print(packages)
#add an item in the list
packages.append("special delivery")
print(packages)

#Output
['Letter', 'Box', 'Parcel']
['Letter', 'Box', 'Parcel', 'special delivery']

Concept 3:

packages = ["Letter", "Box", "Fragile Box", "Parcel", 
"Special Delivery"]
last_package = packages.pop() 
#removes last item in the list
print(packages)
packages.remove("Box") #removes item box
print(packages)

#Output
['Letter', 'Box', 'Fragile Box', 'Parcel']
['Letter', 'Fragile Box', 'Parcel']

Concept 4:

packages = ["Letter", "Box", "Fragile Box", "Parcel"]
position = packages.index("Parcel")
print(position)
packages.sort() # arrange alphabetical order
print(packages)
packages.reverse()
print(packages)

#Output
3
['Box', 'Fragile Box', 'Letter', 'Parcel']
['Parcel', 'Letter', 'Fragile Box', 'Box']

Python basics

Shyamala Chandramohan — Mon, 28 Apr 2025 16:13:47 +0000

Python Print statements :
Concept 1:

print("Hello")
Hello
print ( "hello" )
hello 
print(" HELLO ") #space before H
 HELLO

space inside quotation give space in output message, whereas space outside quotation, python neglects and outputs are same.

Concept 2:

print ("hello","!!!")
hello !!!
print ("hello ","!!!") # space after O
hello  !!!
print ("hello", " !!!") # space before !
hello  !!!
print ("hello" + "!!!")
hello!!!
print ("hello " + "!!!") #space after O
hello !!!

Comma gives a space between words in a message whereas + symbols adds the words and leaves no space between two words. while using + symbol, need a add a space along with the word to get the space in the output message.

Concept 3:

print ("hi", "everyone", "welcome", "all")
hi everyone welcome all
# comma seperates words with a space while printing
print ("hi" + "everyone" + "welcome" + "all")
hieveryonewelcomeall
# + symbol adds the words together before printing
print ("hi " + "everyone " + "welcome " + "all.")
hi everyone welcome all.
# space addded to each word and then message printed

Concept 4: sep means seperator

print ("hello", "world", sep=" ")
hello world
print ("hello", "world", sep="")
helloworld
 print ("hello", "world", sep="\n") #next line
hello
world
print ("hello", "world", sep="\t") # tab
hello   world
print ("hello", "hi", "everyone", "welcome", sep="all")
helloallhialleveryoneallwelcome
print ("hello", "hi", "everyone", "welcome", sep=" all ")
hello all hi all everyone all welcome
print("hello\bworld") #backspace
hellworld
#it prints hello, then gives a backspace, which deletes o then world is printed.

concept 5: adding string & Integer

print ("abc", 123)
abc 123
print ("abc"+ str(123)) #type casting
abc123

Concept 6: String multiplication

print ("Sham "*10)
Sham Sham Sham Sham Sham Sham Sham Sham Sham Sham

Concept 7:
printing names

name = "sham"
print (name)
sham
print ("name")
name

print multiple items and formatting

age = 35
name = "sathesh"
city = "newyork"
print ("Name:", name, "Age:", age, "City:", city)
Name: sathesh Age: 35 City: newyork
print (f"Name: {name}, Age: {age}, city: {city}")
Name: sathesh, Age: 35, city: newyork
print ("Name: {name}") #if f not mentioned
Name: {name}

Concept 8:
join the string

my_first_name="shyamala"
my_last_name="chandramohan"
print(my_first_name, my_last_name, "!")
shyamala chandramohan !
print(my_first_name+ " "+ my_last_name+ " !")
shyamala chandramohan !

Concept 9:
Print numbers and expression

print(12345)
12345
print(1+2+3)
6

print("""This is a
... multiline
... string""")
This is a
multiline
string

Concept 10:
Combine strings and variables using +

temperature = 22.5
print("The temperature is " + str(temperature) + " degrees Celsius.")

Concept 11:
Use the .format() method for string formatting

age = 35
name = "sathesh"
city = "newyork"
print("Name: {}, Age: {}, City: {}".format(name, age, city))
Name: sathesh, Age: 35, City: newyork

Concept 11:
to print raw string (to print a path name, use r"

print(r"C:\Users\Name")
print("C:\\Users\\Name")
C:\Users\Name
C:\Users\Name

Concept 12:
print the value of pi (3.14159) rounded to two decimal places in the format The value of pi is approximately 3.14?

PI=3.14159
print(f"{PI:.2f}")
3.14

DEV Community: Shyamala Chandramohan

Python list

Python basics