Python statements and loops
Assignment for Python statements and loops
- If statement: the program will execute only if the code statement is true
Syntax:
if test expression:
statement(s)
Example:
A = 10;
If A %5 =0;
print (“number is divisible of 5”)
Output: number is divisible of 5
If A is divisible of 5 only than the code is execute. Suppose the A=6 than its reminder is 1 if we divide it with 5 than no code is execute. If u want to execute the code you have to write another if statement.
- If….else statement: it will execute body of if only when the condition is trure. If condition is false then body of else will execute.
Syntax:
if text expression:
body of if
else:
body of else
Example:
A = 10;
if A%5==0
print(“ number is divisible by 5”)
else:
print(“number is not divisible of 5”)
output:
number is divisible by 5
If A is divisible of 5 only than the code of if statement will execute other then the else code will be executed. Suppose the A=6 than its reminder is 1 if we divide it with 5 than else statement code is execute.
- If…. Elif… else: if the condition of if is false, it checks the condition of the next elif block and so on. If all the conditions are false, body of else is executed.
Syntax:
If test expression:
Body of if
Elif test expression:
Body of elif
Else:
Body of else
Example:
A = 10;
if A%5==0
print(“ number is divisible by 5”)
elif A==0
print(“ division not possible”)
else:
print(“number is not divisible of 5”)
output:
number is divisible by 5
If A is divisible of 5 only than the code of if statement will execute other then the else code will be executed. Suppose the A=6 than its reminder is 1 if we divide it with 5 than else statement code is execute. Suppose if the A= 0 then 0 cannot be divided by 5 so it will execute the code of elif statement
- Nested if: one if can be nested in another if. Any number of these statements can be nested inside one another.
Syntax:
If test expression
Example:
year = 2017
if (year % 4) == 0:
if (year % 100) == 0:
if (year % 400) == 0:
print(“it is a leap year)
else:
print(“it is not a leap year”)
else:
print (“it is a leap year”)
else:
print("it is not a leap year”)
Output:
it is not a leap year
Loops:
- For loop: Execute a sequence of statements multiple times and val that manages the loop variable.
Syntax:
For iterating_var in sequence:
statements
Example:
A = 5
Fact = 1
If A < 0;
Print(“factorial for negative number does not exit”)
Elif A == 0;
Print(“the factorial of 0 is 1”)
Else:
for i in range(1, A + 1”)
fact = fact * i
print(“the factorial of “, A, “is” , fact)
output: the factorial of 5 is 120s
- While loop: if we want to execute the statement again and again only if the condition is true then run the while loop.
Syntax:
While expression:
Statements
Example:
A = 0
While (A < 10):
Print(“the number is:”, A )
A = A +1
Print(“ good night”)
Output:
the number is: 0
the number is: 1
the number is: 2
the number is: 3
the number is: 4
the number is: 5
the number is: 6
the number is: 7
the number is: 8
the number is: 9
Good night
- Break statement: if we want to terminate the statement in between and transfers to another statement then break statement is used.
Syntax:
break
Example:
For val in “Python”:
If val == “o”:
break
print(val)
print(“ good night”)
output:
p
y
t
h
Good night
- Continue statement: the continue statement is used to skip the rest of the code inside a loop for the current iteration only. Loop does not terminate but continues on with the next iteration.
Syntax:
Continue
Example:
For val in “Python”:
If val == “o”:
continue
print(val)
print(“ good night”)
output:
p
y
t
h
n
Good night
