Python 1

Hi 🙏. My name is Shravan. This article 👦🏾 will cover the basic Python topics that are important. These topics will be important for beginners as well as a revision for interviews too. If you find this article useful please like and comment about it.

1. Print(“Hello, World”)

In the above line, we just printed directly the string. Alternatively, we can store the string as a variable and use the variable to print it.

Note: Print is a function

Like a=Hello, World

print("Hello, World")
#output
Hello, World

When we use print(a). Output is Hello, World

a="Hello, World"
print(a)
#output
Hello, World

2. If — else Statements

These are conditional statements and are used for making decisions. Condition if is executed if condition satisfies. Otherwise, else is executed.

a=10
b=20
if a>b:
  print("a is greater")
else:
  print("b is greater")
#output
b is greater

3. Arithmetic Operations

The operations like addition(+), subtraction(-), multiplication(*) and division(/)can be performed on the integers.

4. For loop and While loop

For loop

For loop can be used for iterating the list:[ ], set: ( ), tuple: ( ), dictionary: {key: value} and string: ' ' too.

arr=['redmi','realme','oneplus']
for i in arr:
    print(i)
#Outpput
redmi
realme
oneplus

While loop

It is executed until the condition is true

  i=0
  while i<2:
      print(i)
      i+=1
  #Output
  0
  1

In loops there are continue and break statements.

5. Split and join in strings

#Split in strings
a="hi everyone"
print(a.split(''))
#output
['hi','everyone']

#Join in Strings
a="hi everyone"
a=a.split('')
print("-".join(a))
#output
hi-everyone

6. We know that lists are mutable and tuples are immutable. So for changing values in a tuple. We need to convert them into a list and next complete the operations and join it.

Another way is to slice the string and join them back by completing the operations.

7. List comprehensions are like shorter syntax means giving the code in a single line instead of many lines.

array=[]
for i in range(4):
  array.append(i)
print(array)
#Output
[0,1,2,3]

We can convert the above three lines to single lines using list comprehension

print([i for in in range(4)])
#Output
[0,1,2,3]

8. Map function

list(map(int, input().split())

print(list(map(int, input().split()))
#output
[]

only map prints only map object

print(map(int, input().split()))
#output
<map object at 0x1002b2400>

9. Precision Handling

There are still other methods too but I discussed only one method.

b=3.6666
print("{0:.2f}".format(b))
#output
3.66

10. Access Dictionary

dict={key: value}

#To access value 
#1
print(dict.get(key))
#2
print(dict[key])
# Access key
print(dict.keys())

Overall In this article, we covered basic Python topics and In the next article, more topics are covered. If you find my article informative like, share and comment down your thoughts for encouragement.

NSRAI