Electricity bill with slabs

Write a Python program to calculate an electricity bill: first 50 units Rs 0.50, next 100 units Rs 0.75, next 100 units Rs 1.25, above 250 units Rs 1.50, plus a 17% surcharge.

350

438.75
90.67

Approach

1. Walk through the slabs with a loop, charging the units that fall in each one.

Solution

slabs = [(50, 0.50), (100, 0.75), (100, 1.25), (float("inf"), 1.50)] def bill(units):    amount = 0    for size, rate in slabs:        used = min(units, size)        amount += used * rate        units -= used        if units == 0:            break    return round(amount * 1.17, 2) print(bill(350))print(bill(120))

438.75
90.67

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Taxi bill by distance

Write a Python program to calculate a bill: first 5 km at Rs 15/km, next 20 km at Rs 12/km, after that Rs 10/km.

3 km, 18 km, 40 km

3 km -> 45
18 km -> 231
40 km -> 465

Approach

1. Charge each kilometre at the rate of the slab it falls in.

Solution

def fare(km):    total = 0    for k in range(1, km + 1):        if k <= 5:            total += 15        elif k <= 25:            total += 12        else:            total += 10    return total for km in [3, 18, 40]:    print(km, "km ->", fare(km))

3 km -> 45
18 km -> 231
40 km -> 465

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Characters of a string into a list

Write a Python program that adds every character of an input string to an empty list.

sqatools007

Enter text: sqatools007
['s', 'q', 'a', 't', 'o', 'o', 'l', 's', '0', '0', '7']

Approach

1. Append each character in a loop.

Solution

text = input("Enter text: ")chars = []for ch in text:    chars.append(ch)print(chars)

Enter text: sqatools007
['s', 'q', 'a', 't', 'o', 'o', 'l', 's', '0', '0', '7']

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Star pyramid

Write a Python program to print a pyramid of stars with 5 rows (1, 3, 5, 7, 9 stars).

    *
   ***
  *****
 *******
*********

Approach

1. Row i has 2i - 1 stars and n - i leading spaces.

Solution

n = 5for i in range(1, n + 1):    print(" " * (n - i) + "*" * (2 * i - 1))

    *
   ***
  *****
 *******
*********

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Letter A pattern

Write a Python program to print the letter ‘A’ with stars.

  * * * *   
*         * 
*         * 
* * * * * * 
*         * 
*         * 
*         * 

Approach

1. Row 0 is the rounded top, the middle row is the cross bar, and the other rows have stars on both sides.

Solution

rows, cols = 7, 6for r in range(rows):    line = ""    for c in range(cols):        top = r == 0 and 0 < c < cols - 1        bar = r == rows // 2        sides = r > 0 and c in (0, cols - 1)        line += "* " if top or bar or sides else "  "    print(line)

  * * * *   
*         * 
*         * 
* * * * * * 
*         * 
*         * 
*         * 

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Number diamond pattern

Write a Python program to print rows of numbers that grow from 1 to 5 numbers (1 to 15) and then shrink, counting back down (14 to 5).

 1
 2  3
 4  5  6
 7  8  9 10
11 12 13 14 15
14 13 12 11
10  9  8
 7  6
 5

Approach

1. Upper half: keep a counter that increases across rows of length 1 to 5.
2. Lower half: continue from 14 counting down, rows of length 4 to 1.

Solution

n = 5num = 1for row in range(1, n + 1):    print(" ".join(f"{num + i:2}" for i in range(row)))    num += rownum -= 2                     # last printed was 15, continue from 14for row in range(n - 1, 0, -1):    print(" ".join(f"{num - i:2}" for i in range(row)))    num -= row

 1
 2  3
 4  5  6
 7  8  9 10
11 12 13 14 15
14 13 12 11
10  9  8
 7  6
 5

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Letter T pattern

Write a Python program to print the letter ‘T’ with stars: two full rows of 9 stars and a 3-star stem in the middle.

* * * * * * * * * 
* * * * * * * * * 
      * * * 
      * * * 
      * * * 
      * * * 
      * * * 

Approach

1. Print the top bar twice, then the stem rows padded with spaces to centre them.

Solution

width, stem, height = 9, 3, 5for _ in range(2):    print("* " * width)pad = (width - stem) // 2for _ in range(height):    print("  " * pad + "* " * stem)

* * * * * * * * * 
* * * * * * * * * 
      * * * 
      * * * 
      * * * 
      * * * 
      * * * 

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Keep only the digits of the input

Write a Python program that reads text and adds each digit to an empty list as a number.

125python

Enter text: 125python
[1, 2, 5]

Approach

1. Loop over the characters and append the digits converted with int().

Solution

text = input("Enter text: ")numbers = []for ch in text:    if ch.isdigit():        numbers.append(int(ch))print(numbers)

Enter text: 125python
[1, 2, 5]

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Count odd numbers 1 to 100

Write a Python program to count the odd numbers from 1 to 100.

50

Approach

1. Increase a counter for each number with remainder 1.

Solution

count = 0for n in range(1, 101):    if n % 2 != 0:        count += 1print(count)

50

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Count even numbers 1 to 100

Write a Python program to count the even numbers from 1 to 100.

50

Approach

1. Increase a counter for each number with remainder 0.

Solution

count = 0for n in range(1, 101):    if n % 2 == 0:        count += 1print(count)

50

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