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I have sequences generated by python code like this:
TTTTTAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
I would like to iterate through them, and change every character with certain % to N, like 0.2%, otherwise leave it to the original character. How can i do it?
You can use random int for this, like this:
import random
for i in range(len(your_list)):
if random.randint(0,1000)<2: #0.2%chance
your_list[i] = 'N'
Use random.random() in a generator expression and join back to a string.
import random
s = "TTTTTAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
p = 0.002
s2 = "".join("N" if random.random() <= p else c for c in s)
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I have a list like below
l1 = ['a10','b2','a2','c1','b4','c5']
and I want to sum of numeric and output like below
l2 = ['a12','b6','c7'].
Note: do not use in-built function
from collections import Counter
l1 = ['a10','b2','a2','c1','b4','c5']
l2 = [f'{k}{v}' for (k, v) in Counter(''.join(i[0]*int(i[1:]) for i in l1)).items()]
# ['a12', 'b6', 'c6']
Figuring this out is left as an exercise to the reader.
It also assumes the alpha part is always just the first character.
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I have an output of a = "[1,2,3]", how do I convert it to an array a = [1,2,3] from the string in Python?
Thanks!
Try this:
import json
result = json.loads("[1,2,3]")
print(result)
Use ast and then ast.literal_eval()
import ast
print(ast.literal_eval(x))
You can do it without importing stuff
lst = []
for index in range(len(a)):
if a[index].isdigit():
lst.append(int(a[index]))
Then lst will be a list containing all the integers in string a. And if you want to keep the variable name "a", you can
a = lst [::]
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I don't really know how to describe it any better, but I need to write a program that answers this question:
Write a loop that computes the value of a + aa + aaa + aaaa with a given digit as the value of a.
Any advice?
Shortest I could think of
digit = "1"
result = sum([int("{}".format(digit * x)) for x in [1,2,3]])
print(result)
# 123
This repeats the string (sic!) x times, converts the result to an integer and sums the parts up to result.
Here's an approach using a (slightly complicated) list comprehension:
number = 1
length = 4
sum(int(str(number) * i) for i in range(1,length+1))
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I have a .txt file containing a list of lists, each list is a set of coordinates:
[[151.22999572753906, -33.84008789062494], [..., ...],... [..,..]]
I want to know how I can read this file as an array and not as a string so I can easily extract all the coordinates I need.
My code so far:
import re
d = '[[151.22999572753906, -33.84008789062494], [151.22999572753906, -33.84008789062494][151.22999572753906, -33.84008789062494]]'
##l = re.split('[\[\]]', d)
l = re.split('\]\[', d)
print(l)
>>>['[[151.22999572753906, -33.84008789062494], [151.22999572753906, -33.84008789062494', '151.22999572753906, -33.84008789062494]]']
It looks like the contents of your file happen to be valid JSON. If you're sure the format isn't going to vary, you can just use json.load
import json
json.loads('[[151.22999572753906, -33.84008789062494]]')
# or
json.load(open('/path/to/your.txt'))
[[151.22999572753906, -33.84008789062494]]
Start with
PSEUDOCODE
with open(.txt)
n = 0
while True
line = readline
n += 1
print(n , line)
How many Lines did you read?
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How do I convert def stringParametre(x) x to a list so that if x is hello then it will become a list like ["H","E","l","l","O"] . Capitals don't matter .
Note that you do not have to convert to a list if all you want to do is to iterate over the characters of the string:
for c in "hello":
# do something with c
works
Building on #idjaw's comment:
def stringParametre(x):
return list(x)
Of course this will have an error if x is not a string (or other sequence type).
list(x)
OR
mylist = []
for c in x:
mylist.append(c)