diff --git a/README.md b/README.md
index d95b01d..b49ce5b 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
: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)
@@ -2939,6 +2939,15 @@ sorted(some_list, reverse=True)[:3]
```
+
+Convert every string to an integer: [['1', '2', '3'], ['4', '5', '6']]
+
+```
+nested_li = [['1', '2', '3'], ['4', '5', '6']]
+[[int(x) for x in li] for li in nested_li]
+```
+
+
How to merge two sorted lists into one sorted list?
@@ -3003,6 +3012,29 @@ If we call it 3 times, what would be the result each call?
How to iterate over a list in reverse order?
+
+Method 1
+```
+for i in reversed(li):
+ ...
+```
+
+Method 2
+```
+for i in li[::-1]:
+ ...
+```
+
+
+
+Combine [1, 2, 3] and ['x', 'y', 'z'] so the result is [(1, 'x'), (2, 'y'), (3, 'z')]
+
+```
+nums = [1, 2, 3]
+letters = ['x', 'y', 'z']
+
+list(zip(nums, letters))
+```
#### Dictionaries
@@ -3116,6 +3148,34 @@ y = ''.join(set(x))
Find all the permutations of a given string
+
+```
+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
+
@@ -3126,6 +3186,16 @@ y = ''.join(set(x))
Find the frequency of each character in string
+
+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)
+
+```
+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)))
+```
+
+
What is the result of each of the following?
```
@@ -3293,10 +3363,14 @@ def sum(a, b):
```
li = []
-for i in range(1,10):
+for i in range(1, 10):
li.append(i)
```
+
+```
+[for i in in range(1, 10)]
+```
@@ -3345,7 +3419,7 @@ What would be the result of is_int(2) and is_int(False)?
Why one shouldn't use assert in non-test/production code?
-##### Flask
+#### Flask
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)
@@ -3359,6 +3433,31 @@ What would be the result of is_int(2) and is_int(False)?
How do you manage DB integration?
+#### zip
+
+
+Given x = [1, 2, 3], what is the result of list(zip(x))?
+
+```
+[(1,), (2,), (3,)]
+```
+
+
+
+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)))
+```
+
+
+```
+[(0, 0, 0), (1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4)]
+[]
+```
+
+
#### :star: Advanced