Add Python questions and answers

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:information_source:  This repository contains questions on various DevOps and SRE related topics :information_source:  This repository contains questions on various DevOps and SRE related topics
:bar_chart:  There are currently **733** questions :bar_chart:  There are currently **738** questions
:books:  To learn more about DevOps check the resources in [DevOpsBit.com](https://devopsbit.com) :books:  To learn more about DevOps check the resources in [DevOpsBit.com](https://devopsbit.com)
@ -2939,6 +2939,15 @@ sorted(some_list, reverse=True)[:3]
``` ```
</b></details> </b></details>
<details>
<summary>Convert every string to an integer: <code>[['1', '2', '3'], ['4', '5', '6']]</code></summary><br><b>
```
nested_li = [['1', '2', '3'], ['4', '5', '6']]
[[int(x) for x in li] for li in nested_li]
```
</b></details>
<details> <details>
<summary>How to merge two sorted lists into one sorted list?</summary><br><b> <summary>How to merge two sorted lists into one sorted list?</summary><br><b>
</b></details> </b></details>
@ -3003,6 +3012,29 @@ If we call it 3 times, what would be the result each call?
<details> <details>
<summary>How to iterate over a list in reverse order?</summary><br><b> <summary>How to iterate over a list in reverse order?</summary><br><b>
Method 1
```
for i in reversed(li):
...
```
Method 2
```
for i in li[::-1]:
...
```
</b></details>
<details>
<summary>Combine [1, 2, 3] and ['x', 'y', 'z'] so the result is [(1, 'x'), (2, 'y'), (3, 'z')]</summary><br><b>
```
nums = [1, 2, 3]
letters = ['x', 'y', 'z']
list(zip(nums, letters))
```
</b></details> </b></details>
#### Dictionaries #### Dictionaries
@ -3116,6 +3148,34 @@ y = ''.join(set(x))
<details> <details>
<summary>Find all the permutations of a given string</summary><br><b> <summary>Find all the permutations of a given string</summary><br><b>
```
def permute_string(string):
if len(string) == 1:
return [string]
permutations = []
for i in range(len(string)):
swaps = permute_string(string[:i] + string[(i+1):])
for swap in swaps:
permutations.append(string[i] + swap)
return permutations
print(permute_string("abc"))
```
Short way (but probably not acceptable in interviews):
```
from itertools import permutations
[''.join(p) for p in permutations("abc")]
```
Detailed answer can be found here: http://codingshell.com/python-all-string-permutations
</b></details> </b></details>
<details> <details>
@ -3126,6 +3186,16 @@ y = ''.join(set(x))
<summary>Find the frequency of each character in string</summary><br><b> <summary>Find the frequency of each character in string</summary><br><b>
</b></details> </b></details>
<details>
<summary>Given the string (which represents a matrix) "1 2 3\n4 5 6\n7 8 9" create rows and colums variables (should contain integers, not strings)</summary><br><b>
```
matrix = "1 2 3\n4 5 6\n7 8 9"
rows = [ [int(x) for x in li if x != ' '] for li in matrix.split("\n")]
colums = list(zip(*(rows)))
```
</b></details>
<details> <details>
<summary>What is the result of each of the following? <summary>What is the result of each of the following?
``` ```
@ -3297,6 +3367,10 @@ for i in range(1,10):
li.append(i) li.append(i)
``` ```
</summary><br><b> </summary><br><b>
```
[for i in in range(1, 10)]
```
</b></details> </b></details>
<details> <details>
@ -3345,7 +3419,7 @@ What would be the result of is_int(2) and is_int(False)?
<summary>Why one shouldn't use <code>assert</code> in non-test/production code?</summary><br><b> <summary>Why one shouldn't use <code>assert</code> in non-test/production code?</summary><br><b>
</b></details> </b></details>
##### Flask #### Flask
<details> <details>
<summary>You wrote you have experience with Django/Flask. Can you describe what is Django/Flask and how you have used it? Why Flask and not Djano? (or vice versa)</summary><br><b> <summary>You wrote you have experience with Django/Flask. Can you describe what is Django/Flask and how you have used it? Why Flask and not Djano? (or vice versa)</summary><br><b>
@ -3359,6 +3433,31 @@ What would be the result of is_int(2) and is_int(False)?
<summary>How do you manage DB integration?</summary><br><b> <summary>How do you manage DB integration?</summary><br><b>
</b></details> </b></details>
#### zip
<details>
<summary>Given <code>x = [1, 2, 3]</code>, what is the result of list(zip(x))?</summary><br><b>
```
[(1,), (2,), (3,)]
```
</b></details>
<details>
<summary>What is the result of each of the following:
```
list(zip(range(5), range(50), range(50)))
list(zip(range(5), range(50), range(-2)))
```
</summary><br><b>
```
[(0, 0, 0), (1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4)]
[]
```
</b></details>
<a name="python-advanced"></a> <a name="python-advanced"></a>
#### :star: Advanced #### :star: Advanced