Round a float to 2 decimals

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Python Practice › If-Else Programs › Program 39

Round a float to 2 decimals

EasyIf-Else Programs · 39 of 64

Write a Python program that checks whether a value is a float and, if so, rounds it to 2 decimal places.

Input
25.3614, 40
Output
25.3614 -> 25.36
40 is not a float

Approach

  1. Check the type with isinstance, then use round(x, 2).

Solution

Python
for value in [25.3614, 40]:    if isinstance(value, float):        print(value, "->", round(value, 2))    else:        print(value, "is not a float")
Output
25.3614 -> 25.36
40 is not a float

Line by line

Line 3

round(value, 2) keeps two digits after the decimal point.

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Season from a month

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Python Practice › If-Else Programs › Program 38

Season from a month

EasyIf-Else Programs · 38 of 64

Write a Python program that reads a month name and prints its season (Indian seasons: Winter Dec-Feb, Summer Mar-May, Monsoon Jun-Sep, Post-monsoon Oct-Nov).

Input
"February", "May", "August", "October"
Output
February -> Winter
May -> Summer
August -> Monsoon
October -> Post-monsoon

Approach

  1. Check which group of months contains the input.

Solution

Python
def season(month):    month = month.capitalize()    if month in ("December", "January", "February"):        return "Winter"    elif month in ("March", "April", "May"):        return "Summer"    elif month in ("June", "July", "August", "September"):        return "Monsoon"    elif month in ("October", "November"):        return "Post-monsoon"    return "Unknown month" for m in ["February", "May", "August", "October"]:    print(m, "->", season(m))
Output
February -> Winter
May -> Summer
August -> Monsoon
October -> Post-monsoon

Line by line

Lines 3-10

Each elif checks one season’s months.

Line 11

A final return covers anything that matched no season.

Note

The original sample said February is Summer. Season boundaries vary by country; this solution uses the common Indian classification with February in Winter.

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Isosceles triangle check

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Python Practice › If-Else Programs › Program 37

Isosceles triangle check

EasyIf-Else Programs · 37 of 64

Write a Python program to check whether a triangle is isosceles (at least two equal sides).

Input
(10, 15, 10), (8, 9, 10)
Output
(10, 15, 10) is isosceles
(8, 9, 10) is not isosceles

Approach

  1. Any one pair of equal sides is enough, so join the checks with or.

Solution

Python
for a, b, c in [(10, 15, 10), (8, 9, 10)]:    if a == b or b == c or a == c:        print((a, b, c), "is isosceles")    else:        print((a, b, c), "is not isosceles")
Output
(10, 15, 10) is isosceles
(8, 9, 10) is not isosceles

Line by line

Line 2

or is true if any pair matches. By this definition an equilateral triangle is also isosceles.

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Scalene triangle check

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Python Practice › If-Else Programs › Program 36

Scalene triangle check

EasyIf-Else Programs · 36 of 64

Write a Python program to check whether a triangle is scalene (all three sides different).

Input
(10, 15, 18), (10, 15, 10)
Output
(10, 15, 18) is scalene
(10, 15, 10) is not scalene

Approach

  1. All sides are different when no two are equal.

Solution

Python
for a, b, c in [(10, 15, 18), (10, 15, 10)]:    if a != b and b != c and a != c:        print((a, b, c), "is scalene")    else:        print((a, b, c), "is not scalene")
Output
(10, 15, 18) is scalene
(10, 15, 10) is not scalene

Line by line

Line 2

All three pairs must differ; len({a, b, c}) == 3 is a shorter test.

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Equilateral triangle check

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Python Practice › If-Else Programs › Program 35

Equilateral triangle check

EasyIf-Else Programs · 35 of 64

Write a Python program to check whether a triangle is equilateral (all three sides equal).

Input
(10, 10, 10), (10, 15, 10)
Output
(10, 10, 10) is equilateral
(10, 15, 10) is not equilateral

Approach

  1. Compare all three sides with a chained ==.

Solution

Python
for a, b, c in [(10, 10, 10), (10, 15, 10)]:    if a == b == c:        print((a, b, c), "is equilateral")    else:        print((a, b, c), "is not equilateral")
Output
(10, 10, 10) is equilateral
(10, 15, 10) is not equilateral

Line by line

Line 2

a == b == c means a == b and b == c.

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Days in a month

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Python Practice › If-Else Programs › Program 34

Days in a month

EasyIf-Else Programs · 34 of 64

Write a Python program to convert a month name to its number of days.

Input
"February", "April", "July"
Output
February -> 28/29 days
april -> 30 days
July -> 31 days
Smarch -> invalid month

Approach

  1. Group months by their length with in.

Solution

Python
def days_in(month):    month = month.capitalize()    if month == "February":        return "28/29 days"    elif month in ("April", "June", "September", "November"):        return "30 days"    elif month in ("January", "March", "May", "July", "August", "October", "December"):        return "31 days"    else:        return "invalid month" for m in ["February", "april", "July", "Smarch"]:    print(m, "->", days_in(m))
Output
February -> 28/29 days
april -> 30 days
July -> 31 days
Smarch -> invalid month

Line by line

Line 2

capitalize() accepts any letter case from the user.

Lines 5-8

Tuples list the 30-day and 31-day months.

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Check a consonant

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Python Practice › If-Else Programs › Program 33

Check a consonant

EasyIf-Else Programs · 33 of 64

Write a Python program to check whether a letter is a consonant.

Input
"B", "e", "7"
Output
B is a consonant
e is not a consonant
7 is not a consonant

Approach

  1. A consonant is a letter (isalpha()) that is not a vowel.

Solution

Python
for ch in ["B", "e", "7"]:    if ch.isalpha() and ch.lower() not in "aeiou":        print(ch, "is a consonant")    else:        print(ch, "is not a consonant")
Output
B is a consonant
e is not a consonant
7 is not a consonant

Line by line

Line 2

Checking isalpha() first stops digits and symbols from being called consonants.

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Check a vowel

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Python Practice › If-Else Programs › Program 32

Check a vowel

EasyIf-Else Programs · 32 of 64

Write a Python program to check whether a letter is a vowel.

Input
"A", "k"
Output
A True
k False

Approach

  1. Lower-case the letter and check membership in “aeiou”.

Solution

Python
for ch in ["A", "k"]:    if ch.lower() in "aeiou":        print(ch, True)    else:        print(ch, False)
Output
A True
k False

Line by line

Line 2

in on a string checks whether the character appears in it.

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Fizz Buzz for multiples of 2 and 3

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Python Practice › If-Else Programs › Program 31

Fizz Buzz for multiples of 2 and 3

EasyIf-Else Programs · 31 of 64

Write a Python program that prints “FizzBuzz” for multiples of both 2 and 3, “Fizz” for multiples of 2 and “Buzz” for multiples of 3; otherwise print the number.

Input
14, 9, 6, 7
Output
14 Fizz
9 Buzz
6 FizzBuzz
7 7

Approach

  1. Test the combined case first, then each single case.

Solution

Python
for n in [14, 9, 6, 7]:    if n % 2 == 0 and n % 3 == 0:        print(n, "FizzBuzz")    elif n % 2 == 0:        print(n, "Fizz")    elif n % 3 == 0:        print(n, "Buzz")    else:        print(n, n)
Output
14 Fizz
9 Buzz
6 FizzBuzz
7 7

Line by line

Line 2

Multiples of both must be checked first, otherwise 6 would stop at “Fizz”.

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Check a leap year

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Python Practice › If-Else Programs › Program 30

Check a leap year

EasyIf-Else Programs · 30 of 64

Write a Python program to check whether a year is a leap year.

Input
2000, 1900, 2024
Output
2000 is a leap year
1900 is not a leap year
2024 is a leap year

Approach

  1. Divisible by 400: leap. Else divisible by 100: not leap. Else divisible by 4: leap.

Solution

Python
for year in [2000, 1900, 2024]:    if year % 400 == 0:        print(year, "is a leap year")    elif year % 100 == 0:        print(year, "is not a leap year")    elif year % 4 == 0:        print(year, "is a leap year")    else:        print(year, "is not a leap year")
Output
2000 is a leap year
1900 is not a leap year
2024 is a leap year

Line by line

Lines 2-7

The rules are checked from the most specific (400) to the most general (4), which is why the order matters.

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