﻿ Python: Convert an integer to a roman numeral - w3resource

# Python: Convert an integer to a roman numeral

## Python Class: Exercise-1 with Solution

Write a Python class to convert an integer to a Roman numeral.

Sample Solution-1:

Python Code:

``````class py_solution:
def int_to_Roman(self, num):
val = [
1000, 900, 500, 400,
100, 90, 50, 40,
10, 9, 5, 4,
1
]
syb = [
"M", "CM", "D", "CD",
"C", "XC", "L", "XL",
"X", "IX", "V", "IV",
"I"
]
roman_num = ''
i = 0
while  num > 0:
for _ in range(num // val[i]):
roman_num += syb[i]
num -= val[i]
i += 1
return roman_num

print(py_solution().int_to_Roman(1))
print(py_solution().int_to_Roman(4000))
```
```

Sample Output:

```I
MMMM
```

Pictorial Presentation: Flowchart: ## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Sample Solution-2:

Convert an integer to its roman numeral representation. Accepts value between 1 and 3999 (both inclusive).

• Create a lookup list containing tuples in the form of (roman value, integer).
• Use a for loop to iterate over the values in lookup.
• Use divmod() to update num with the remainder, adding the roman numeral representation to the result.

Python Code:

``````class py_solution:
def int_to_Roman(self, num):
lookup = [
(1000, 'M'),
(900, 'CM'),
(500, 'D'),
(400, 'CD'),
(100, 'C'),
(90, 'XC'),
(50, 'L'),
(40, 'XL'),
(10, 'X'),
(9, 'IX'),
(5, 'V'),
(4, 'IV'),
(1, 'I'),
]
res = ''
for (n, roman) in lookup:
(d, num) = divmod(num, n)
res += roman * d
return res
print(py_solution().int_to_Roman(1))
print(py_solution().int_to_Roman(500))
print(py_solution().int_to_Roman(755))
print(py_solution().int_to_Roman(1200))
print(py_solution().int_to_Roman(3456))
```
```

Sample Output:

```I
D
DCCLV
MCC
MMMCDLVI
```

Flowchart: ## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor:

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﻿

## Python: Tips of the Day

Combining Lists Using Zip:

• Takes multiple collections and returns a new collection.
• The new collection contains items where each item contains one element from each input collection.
• It allows us to transverse multiple collections at the same time.
```name = 'abcdef'
suffix = [1,2,3,4,5,6]
zip(name, suffix)
--> returns (a,1),(b,2),(c,3),(d,4),(e,5),(f,6)
```

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