Interactive interpreter prompt
print ("hello world"); -------> click enter
Using a script file (Script Mode Programming)
Open Python
New file
Type : print("hello world");
Save with .py extension
Run --->>f5
Output: will appear on Python Console
we can also run the file using the operating system terminal. But, we should be aware of the path of the directory where we have saved our file.
- Open the command line prompt and navigate to the directory.
============================================================================================
Multiline Program
name="hari taraka prabhu"
age="31"
branch="computer science"
print("My name is: ", name, )
print("---------------------------------------------------------------------")
print("My age is: ", age)
print("---------------------------------------------------------------------")
print(name,"age is", age)
print("---------------------------------------------------------------------")
print ("my name is:",name, "and my age is:",age,", and iam studing in: ",branch)
print("---------------------------------------------------------------------")
OUTPUT:
========= RESTART: C:\Users\mhtpr\Documents\FormatFactory\multi_line.py ========
My name is: hari taraka prabhu
---------------------------------------------------------------------
My age is: 31
---------------------------------------------------------------------
hari taraka prabhu age is 31
---------------------------------------------------------------------
my name is: hari taraka prabhu and my age is: 31 , and iam studing in: computer science
---------------------------------------------------------------------
============================================================================================
In Python, statements that are the same level to the right belong to the same block. We can use four whitespaces to define indentation. Let's see the following lines of code.
Loop Block
list1 = [1, 2, 3, 4, 5]
for i in list1:
print(i)
if i==4:
break
print("End of for loop")
Output:
========= RESTART: C:/Users/mhtpr/Documents/FormatFactory/loop_block.py ============================
1
2
3
4
End of for loop
============================================================================================
Comments Program in Python
name = "Thomas" # Assigning string value to the name variable
Fees = 10000 # defining course fees is 10000
Fees = 20000 # defining course fees is 20000
print (name,Fees)
print ("===============================")
#Single-Line Comment - Single-Line comment starts with the hash # character followed by text for further explanation.
Marks = 90 # defining the marks of a student
Name = "James" # the name of a student is James
Branch = "Computer Science" # defining student branch
print (Marks, Name, Branch)
#Multi-Line Comments - Python doesn't have explicit support for multi-line comments but we can use hash # character to the multiple lines. For example -
OUTPUT
============================================================== RESTART: C:/Users/mhtpr/Documents/FormatFactory/comments.py =============================================================
Thomas 20000
===============================
90 James Computer Science
============================================================================================
Python Identifiers
Python identifiers refer to a name used to identify a variable, function, module, class, module or other objects. There are few rules to follow while naming the Python Variable.
- A variable name must start with either an English letter or underscore (_).
- A variable name cannot start with the number.
- Special characters are not allowed in the variable name.
- The variable's name is case sensitive.
Example:
number = 10
print(number)
_a = 100
print(_a)
x_y = 1000
print(x_y)
Output:
10
100
1000
