## Increment values in a list of lists starting from 1

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I have a list of lists e.g `[[0, 0], [4, 0], [2, 0], [5, 3], [0, 1]]`

My desired output is `[[0, 0], [1, 0], [2, 0], [3, 4], [0, 5]]`

That is, I wish to modify the list such that if the value is not zero, I set it to the count, which starts at 1 and increments by 1 for each non-zero value. If it's 0, I keep it as 0.

How do I go about this? I started by indexing using `enumerate` but it's harder than I thought.

Here is what I have done: `w` generates the initial list. This is not my full code because it is too long to post.

```w = [[i if i != l else 0 for i in x] for x in c]
print(w)
inc = 1
lx = []
gg = []
for i in w:
if i or i !=0:
g = w.index(i)
gg.append(g)
lx.append(i)
for x in gg:
for i, v in enumerate(w):
if x==i:
if
print(x, i, v)
```

Thank you

This would also work, probably more pythonic and shorter, using a list-comprehension:

```from itertools import count

lst = [[0, 0], [4, 0], [2, 0], [5, 3], [0, 1]]
counter = count(1)

lst = [[next(counter) if x != 0 else 0 for x in sublst] for sublst in lst]
# [[0, 0], [1, 0], [2, 0], [3, 4], [0, 5]]
```

Learn more about how `itertools.count` works here, meanwhile here is a small snippet for a better understanding:

```>>> import itertools
>>> c = itertools.count(1)
>>> next(c)
1
>>> next(c)
2
```

Increase all of a lists values by an increment, Specific answer. With list comprehensions: In : list1 = [1,2,3,4,5,6] In : [x+170 for x in list1] Out: [171, 172, 173, 174, 175, 176]. With map : Increment values in a list of lists starting from 1. That is, I wish to modify the list such that if the value is not zero, I set it to the count, which starts at 1 and increments by 1 for each non-zero value. If it's 0, I keep it as 0.

I think you're over-complicating this. If either elem is 0, you don't need to touch it. If it's something else, increment the count and stick it in the right place.

```nums = [[0, 0], [4, 0], [2, 0], [5, 3], [0, 1]]
count = 0
for i,(a,b) in enumerate(nums):
if a != 0:
count += 1
nums[i] = count
if b != 0:
count += 1
nums[i] = count

print nums
```

Output:

```[[0, 0], [1, 0], [2, 0], [3, 4], [0, 5]]
```

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If your sublists are two element you can get rid of enumerate

```from itertools import count
counter = count(1)
lst = [[0, 0], [4, 0], [2, 0], [5, 3], [0, 1]]
for pair in lst:
pair = next(counter) if pair else 0
pair = next(counter) if pair else 0
print(lst)
```

For longer or variable sublists you may use either enumerate, map or list comprehension

```from itertools import count
counter = count(1)
lst = [[0, 0], [4, 0], [2, 0], [5, 3], [0, 1], [0, 1, 3, 3, 3], ]
for sublist in lst:
sublist[:] = map(lambda x: (next(counter) if x else 0), sublist)
# slice assignment is 'in-place' assignment

from itertools import count
counter = count(1)
lst = [[0, 0], [4, 0], [2, 0], [5, 3], [0, 1], [0, 1, 3, 3, 3], ]
for sublist in lst:
for i, element in enumerate(sublist):
sublist[i] = next(counter) if element else 0
```

9. Lists, Lists are similar to strings, which are ordered sets of characters, except that the elements of a numbers[-1] is the last element of the list, numbers[-2] is the second to last, and If the step size is negative, then start must be greater than stop. How to Automatically Fill Sequential Data into Excel with the Fill Handle Lori Kaufman @howtogeek November 3, 2016, 10:24am EDT The Fill Handle in Excel allows you to automatically fill in a list of data (numbers or text) in a row or column simply by dragging the handle.

Python lists - working with lists in Python, Values of a list are called items or elements of the list. A list can simple.py. #!/​usr/bin/env python # simple.py nums = [1, 2, 3, 4, 5] print(nums) print(nums[-1]) print(nums) Note that list index numbers start from zero. My Multilevel list is using standard number incrementing e.g. 1, 1.1, 1.1.1, etc Created from scratch with no other lists in the document apart from Table of Contents I have assigned default styles from Word e.g. 1. = Heading2, 1.1 = Heading3, 1.1.1 = Body Text, etc.

Python, Given a list of lists, write a Python program to count the number of sublists containing the given element x. Examples: Input : lst = [1, 3, 5], [1, 3, 5, 7], [1, 3, 5, 7, 9]] x = 1 Output : 3 Input : lst = (['a'], ['a', 'c', 'b'], ['d']) x = 'a' Initialize count to 0, then start a for loop and check if x exists in each list or not. If yes, increment count. Examples of how to create a list of numbers in python using list comprehensions or built-in functions list(): Create a list of integers Create a list of floats using arange

Python List Comprehension Tutorial, Instead, you store all of these values in a Python list. Lists are one of the four built​-in data structures in Python. Other data Now it's your turn now to go ahead and get started with list comprehensions in Python! Let's stick  The simplest data structure in Python and is used to store a list of values. Lists are collections of items (strings, integers, or even other lists). Each item in the list has an assigned index value. Lists are enclosed in [ ] Each item in a list is separated by a comma Unlike strings, lists are mutable, which means they can be changed.