Revision Python Control
Structures
1.
Name the flow control statement used in each of the following:
a) Execute program
statements in a sequence
b) Make a decision
c) Select one of
the two alternatives
d) Select from one
of the several alternatives
e) Repeat a set of
statements determinate number of times
f) Repeat a set of
statements as long as the condition is True, indeterminate times
2.
Find the output produced by the
following code snippets:
(a)
for the input:
(i)
6 (ii) 9 (iii) 4
(iv) 2
n = int(input('Enter number of sides:'))
print('Figure',end=":")
if n==1 or n==2 :
print('Line / parallel
lines')
elif n == 3 :
print('Triangle')
elif n == 4 :
print('Quadrilateral')
elif n== 5 :
print('Pentagon')
elif n == 6 :
print('Hexagon')
else :
print('Not in range')
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(b)
for the input:
(i)
1 (ii) 12 (iii) 123
(iv) 1234
num = int(input('enter a number '))
if num
> 9 and num <= 99 :
print(num , 'is a two digit number')
elif
num > 99 and num <= 999 :
print(num , 'is a three digit number')
else :
print(num , ' is less than 10 or greater than 999' )
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(c
)for the input:
(i) a=15 (ii) a=18, b=yes (iii) a=18, b=no
a = int(input('Enter your age '))
if a >= 18:
b = input('Do you have
a license? ')
if b == 'yes' :
print('eligible to
drive')
print('go on')
else :
print('get a
license')
else :
print('under age')
print('thank you for the info')
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(d)
for the input:
(i)
age=10 (ii) age=15 (iii) age=20
if age
>= 18 :
print('Adult')
else :
if age >= 13:
print('Teenager')
else :
print('Child')
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(e)
for the input:
ph=5,
ph=10, ph=15, ph=7
Lst1 = range(1,7)
Lst2 = range(8,15)
ph = int(input('Enter pH '))
if ph in Lst1 :
print('Acidic')
elif ph == 7:
print('Neutral')
elif ph in Lst2 :
print('Basic')
else :
print('Invalid')
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(f)for
parameters :
(i) a, b =’Ashish’ , ‘Sharma’
(ii) a, b = None, None
def
greeting(a,b) :
if a == None and b == None :
print('Hello World')
else :
print('Hello ' + b[0:2] + ' ' + a)
greeting(a,b)
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3. Rewrite the
following code in Python after removing all syntax error(s). Underline each
correction done in the code.
I
num = integer(input('Enter
a number'))
if num % 10 == 0
print(Divisible
by 10)
else
print(Not
divisible by 10)
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II
Def show(d)
If d == 'saturday' or d
== 'sunday' :
print 'weekend'
else :
print 'weekday'
return
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4. Write a if statement to assign result as ‘Pass’ if
marks greater than or equal to 33, otherwise assign
result as ‘Fail’.
5. Write a if
statement to display “Belongs to family”
if num is divisible by 5, otherwise display “Not in
family”.
6. Write if statement to assign weather as ‘hot’ if
temp is 30 or above , assign weather as ‘pleasant’ if
temp is
between 10 and 31, assign weather as ‘cold’ if temp is below 10.
7. Write a program to input name and marks out of 100
each in 5 subjects. Calculate the
percentage [ perc = grandtotal / 5 ] and
display result as ‘Pass’ or ‘Fail’. Also display the remarks
according to
the following criteria:
Percentage Remarks
80 and
above Outstanding
Between 70 and 79 Distinction
Between
60 and 69 First Division
8. Write the output of the following range() statements
a)
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range(10)
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b)
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range(1,10)
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c)
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range(1,10,2)
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d)
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range(10,0,-1)
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e)
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range(10,0,-2)
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f)
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range(2,11,2)
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g)
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range(-5,5)
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h)
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range(1,2)
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i)
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range(1,1)
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j)
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range(1,-1)
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k)
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range(1,-1,-1)
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l)
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range(0)
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9. How many
times will the following loops be executed? Also write the output.
a)
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a = 10
while a <= 100 :
print(a)
a += 10
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d)
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a = 10
while a <= 20 :
if a % 5 == 0 :
print(a)
a += 2
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b)
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a = 10
while a > 1 :
print(“*”)
a -= 1
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e)
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for a in range(10, 0,-2):
print( a // 2 , end=”:”)
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c)
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a = 10
while a > 1
print( a * a )
a -= 2
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f)
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for a in range(50,0,-10) :
print(a, end=’,’)
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10. Write the output produced by the following code
fragments:
(a)
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(b)
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(c)
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num = 1825
acc = 0
while num > 0 :
d = num % 10
if d % 2 == 0 :
acc += d //2
else:
acc += d ** 2
num = num // 10
print(acc)
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num = 1825
ctr = 0
while num > 0 :
d = num % 10
ctr += 1
num = num // 10
print(ctr)
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num = 1825
p = 1
while num > 0 :
d = num % 10
p *= d
num = num // 10
print(p)
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11. The
following function convert() is written in a file fun.py
def convert(dollar) :
rs =
dollar * 71
return
rs
Write the statement to execute this function at python shell
for parameter 5. Also write the output produced.
12. The following functions area() and
peri() are defined in the module square.py
def area(s) :
return
s * s
def peri(s) :
return 4 * s
Write the statements to execute these function at python
shell for parameter 5.
13. Consider the following function
definitions, predict the output for the given function call statements:
(a)
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(b)
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©
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def multiply(a,b=1):
return a * b
print(multiply(5,2))
print(multiply(5))
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def repeat(a=10,b='@') :
for i in range(a) :
print(b, end='')
repeat(5,'*')
repeat(4)
repeat()
repeat(b='#',a=3)
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Loops are used
to iterate over elements of a sequence, it is
often used
when a piece of code which
you
want to repeat “n” number of time.
A for loop is used
for
iterating over a sequence (that is either a list,
a tuple
or a string).With the
for loop we
can execute a set of statements,
once for each item in a list, tuple,
set etc.
Syntax:
for var in sequence:
statements(s)
else:
statements(s)
Here, val is the variable that takes the value
of the item inside the sequence on each iteration. Else statement(s) will be executed
when loop terminated normally(without break statement)
Q Show 0 to 4
for i
in 0,1,2,3,4:
print (i)
or
for i in range(5):
print(i)
We can generate a sequence of
numbers using range() function. range(10) will generate numbers from 0 to 9 (10 numbers).
We can also define the start, stop and step size as range(start,stop,step size). step size defaults to 1 if not provided,
start value is 0 if not provided.
Q1 Show 1
to
10
for i in range (1,11):
print (i)
Q2 Show 10 to 1 horizontally
for i in range(10,0,‐1):
print (i,end=" ")
Q3 Show 1st
10 even nos
for i in range (0,20,2):
print (i)
else:
print("finished")
Q4 Show sum of 1st
10 nos
s=0
for i in range (1,11):
s=s+i
print (‘sum =’,s)
Q5 Take a no and show table of it
a=int(input('enter anyno'))
for i in range (1,11):
print (i*a)
Q6 Take a no and show table of it in proper format
a=int(input('enter anyno'))
for i in range (1,11):
print (i,'*',a,'=',i*a)
Q7 Show factorial of 5
f=1
for i in range (1,6):
f=f*i
print ("factorial of 5 is ",
f)
Q8 Take a no and show factorial of it
f=1
a=int(input("enter any no"))
for i in range (1,a+1):
f=f*i
print ('factorial of',a,'is',f)
Q9 Take a no and check prime or not
a=int(input("enter any no"))
k=0
for i in range(2,a):
if(a%i==0): k=1 break
if k==0:
print("prime ")
else:
print("not prime")
Q10 Take a no and check prime or not using for else
a=int(input("enter any no"))
for i in range(2,a):
if(a%i==0):
print(a,"is not prime no")
break
else:
# else will be executed when for loop complete its sequence
(break not executed)
print("prime ");
Q11 Print the format
*
* *
* * *
* * * *
for i in range(1,5):
print("*"*i)
break is used to
exit a for loop or a while loop,
whereas continue is used to skip the current
block, and return to the
"for" or "while" statement.
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