﻿ Python: Round a Decimal value to the nearest multiple of 0.10, unless already an exact multiple of 0.05 - w3resource # Python: Round a Decimal value to the nearest multiple of 0.10, unless already an exact multiple of 0.05

## Python module: Exercise-3 with Solution

Write a Python program to round a Decimal value to the nearest multiple of 0.10, unless already an exact multiple of 0.05. Use decimal.Decimal

Sample Solution:

Python Code:

``````from decimal import Decimal
#Source: https://bit.ly/3hEyyY4

def round_to_10_cents(x):
remainder = x.remainder_near(Decimal('0.10'))
if abs(remainder) == Decimal('0.05'):
return x
else:
return x - remainder

# Test code.
for x in range(80, 120):
y = Decimal(x) / Decimal('1E2')
print("{0} rounds to {1}".format(y, round_to_10_cents(y)))
```
```

Sample Output:

```0.80 rounds to 0.80
0.81 rounds to 0.80
0.82 rounds to 0.80
0.83 rounds to 0.80
0.84 rounds to 0.80
0.85 rounds to 0.85
0.86 rounds to 0.90
0.87 rounds to 0.90
0.88 rounds to 0.90
0.89 rounds to 0.90
0.90 rounds to 0.90
0.91 rounds to 0.90
0.92 rounds to 0.90
0.93 rounds to 0.90
0.94 rounds to 0.90
0.95 rounds to 0.95
0.96 rounds to 1.00
0.97 rounds to 1.00
0.98 rounds to 1.00
0.99 rounds to 1.00
1.00 rounds to 1.00
1.01 rounds to 1.00
1.02 rounds to 1.00
1.03 rounds to 1.00
1.04 rounds to 1.00
1.05 rounds to 1.05
1.06 rounds to 1.10
1.07 rounds to 1.10
1.08 rounds to 1.10
1.09 rounds to 1.10
1.10 rounds to 1.10
1.11 rounds to 1.10
1.12 rounds to 1.10
1.13 rounds to 1.10
1.14 rounds to 1.10
1.15 rounds to 1.15
1.16 rounds to 1.20
1.17 rounds to 1.20
1.18 rounds to 1.20
1.19 rounds to 1.20
```

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## Python: Tips of the Day

For-else construct useful when searched for something and find it:

```# For example assume that I need to search through a list and process each item until a flag item is found and
# then stop processing. If the flag item is missing then an exception needs to be raised.

for i in mylist:
if i == theflag:
break
process(i)
else:
raise ValueError("List argument missing terminal flag.")
```