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BASIC SYNTAX:
First Python Program
let us execute programs in different models of programming.
Interactive Mode Programming
Invoking the interpreter without passing a script file as a parameter brings up the
following promt-
First Python Program
`` `
$python
Python 2.4.3(#1,Nov 11 2010, 13:34:43)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on
linux2
Type "help", "copyright", "credits", or
"licence" for more infomation
>>>>>>>
Type the following text at the python promt and press the enter-
>>>>> print"Hello,Python"
if you are running new version of python , then you would need to use print statement with
parenthesis as in print("Hello,Python");. However in Python version 2.4.3, this
produces the following result-
print("Hello,Python")
Output:
Hello,Python
Script Mode Programming
Invoking interpreter with a script parameter begins execution of the script and continues until
the script is finished. When the script is finished, the interpreter is no longer active.
let us write a simple Python program in a script .Python files have extensions .py
Type the following source code in a test.py file-
Comments
# this is a single-line Comments
"""
This is a multi-line comment or docstring.
"""
condition
age = int(input("Enter your age:"))
if age >= 18:
print("you are an adult.")
elif age > 12:
print("you are a teenager.")
else:
print("you are a child.")
for loop
for i in range(5):
print(i)
count = 0
while count < 5:
variables
Varirables
variables are nothing but reserved memory locations to store values. This means that
when you create a variable you reserve some space in the memory.
Based on the data type of a variable,the interpreter allocates memory and decides what
can be stored in the reserved memory. Therefore, by assigning different data types to variables
you can store integers, decimals or characters in these variables.
Assigning Values to variables
Python variables do not need explicit declaration to reserve memory space. The
declaration happens automatically when you assign a value to a variable.The equal
Sign(=) is used to assig values to variables
The operand to the left of the = operator is the name of the variable and the operand
to the right of the = operator is the value stored in the variables.For example-
#!/user/bin/python
counter = 100 # An interger assignment
mile = 1000.0 # A float point
name = "John" # A string
print counter
print miles
print name
Here, 100, 1000.0 and "John" are the values assigned to couter,miles,and name variables, repectively
This produces the following results-
name = input("Enter your name: ")
print(f"hello, {name}!")
Output:
output:
Enter your name: fortune
hello, fortune
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