﻿ Python: Convert the values of RGB components to a hexadecimal color code - w3resource

# Python: Convert the values of RGB components to a hexadecimal color code

## Python String: Exercise-95 with Solution

Write a Python program to convert the values of RGB components to a hexadecimal color code.

Create a placeholder for a zero-padded hexadecimal value using '{:02X}' and copy it three times.

Use str.format() on the resulting string to replace the placeholders with the given values.

Sample Solution:

Python Code:

``````def rgb_to_hex(r, g, b):
return ('{:02X}' * 3).format(r, g, b)

print(rgb_to_hex(255, 165, 1))
print(rgb_to_hex(255, 255, 255))
print(rgb_to_hex(0, 0, 0))
print(rgb_to_hex(0, 0, 128))
print(rgb_to_hex(192, 192, 192))
```
```

Sample Output:

```FFA501
FFFFFF
000000
000080
C0C0C0
```

Flowchart:

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## Python: Tips of the Day

Check if a given key already exists in a dictionary:

In is the intended way to test for the existence of a key in a dict.

```d = {"key1": 10, "key2": 23}

if "key1" in d:
print("this will execute")

if "nonexistent key" in d:
print("this will not")
```

If you wanted a default, you can always use dict.get():

```d = dict()

for i in range(100):
key = i % 10
d[key] = d.get(key, 0) + 1
```

and if you wanted to always ensure a default value for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:

```from collections import defaultdict

d = defaultdict(int)

for i in range(100):
d[i % 10] += 1
```

but in general, the in keyword is the best way to do it.

Ref: https://bit.ly/2XPMRyz