I have a list of IDs that I wish to extract, specifically for ID the intermediate values.
For example, the 1st ID is : garden/trade.FX.fwd/nyk12523adn
I wish to remove the values 'garden/', and '/nky12523adn', perhaps using string.replace()...
How might I do that efficiently? The starting logic would be to
string.find('/'), to get the location
then remove the prefix for the first '/', and suffix for the 2nd '/'
Is there an efficient way to do this?
you can also use .split() method
The split() method splits a string into a list.
You can specify the separator, default separator is any whitespace.
Syntax
string.split(separator, maxsplit)
id = "garden/trade.FX.fwd/nyk12523adn"
print (id.split('/')[1])
output:
trade.FX.fwd
if you want to use .find() function:
id = "garden/trade.FX.fwd/nyk12523adn"
idx_start = id.find('/') # find index of first '/'
idx_end = id.find('/',idx_start + 1) # find index of second '/'
print (id[idx_start+1:idx_end]) # use list slicing
output :
trade.FX.fwd
Related
The lambda I am working on gets triggered through API gateway.
I want to extract the a specific value from the path in the URL.
Sample URL : {id}/contacts
or
{id-0}/{id}/contacts
In order to extract the path variable I am using event.pathParamters
which gives me the value, but I need to only extract {id} from the path.
I am using the following code to split the path param and extract the {id}, but this is not a feasible option:
arr = path.split("/");
id = arr[arr.length-2];
Are there better ways to extract {id}? The position of this id will be always last right before api name (in his case <<contacts>>).
This would extract the string which is located between the last two occurrences of / or the first occurrence if two / do not exist
([^\/]+)\/[^\/]+$
https://regex101.com/r/tZNhrk/1
Would you please try the following;
import re
str = '{id-0}/{id}/contacts' # example
api_name = 'contacts' # api name
m = re.search(r'[^/]+(?=/%s)' % api_name, str)
if m:
id = m.group()
The regex [^/]+(?=/%s) matches a string of non-slash characters which is followed by a slash and the specified api_name. If the regex matches, m.group() is assigned to it.
I have a string, I have to get digits only from that string.
url = "www.mylocalurl.com/edit/1987"
Now from that string, I need to get 1987 only.
I have been trying this approach,
id = [int(i) for i in url.split() if i.isdigit()]
But I am getting [] list only.
You can use regex and get the digit alone in the list.
import re
url = "www.mylocalurl.com/edit/1987"
digit = re.findall(r'\d+', url)
output:
['1987']
Replace all non-digits with blank (effectively "deleting" them):
import re
num = re.sub('\D', '', url)
See live demo.
You aren't getting anything because by default the .split() method splits a sentence up where there are spaces. Since you are trying to split a hyperlink that has no spaces, it is not splitting anything up. What you can do is called a capture using regex. For example:
import re
url = "www.mylocalurl.com/edit/1987"
regex = r'(\d+)'
numbers = re.search(regex, url)
captured = numbers.groups()[0]
If you do not what what regular expressions are, the code is basically saying. Using the regex string defined as r'(\d+)' which basically means capture any digits, search through the url. Then in the captured we have the first captured group which is 1987.
If you don't want to use this, then you can use your .split() method but this time provide a split using / as the separator. For example `url.split('/').
I have list of demangled-function names like _Z6__comp7StudentS_
_Z4SortiSt6vectorI7StudentSaIS0_EE. I read wiki and found out that it follows some sort of defined structure. _Z is mangled Symbol followed by a number and then the function name of that length.
So I wanted to retrieve that function name using regex. I only come close to _Z(?:\d)(?<function_name>[a-z_A-Z]){\1}. But referring \1 won't work because its string, right? Is there a single regex pattern solution to this.
You can use 2 capture groups, and get the part of the string using the position of capture group 2
import re
pattern = r"_Z(\d+)([a-z_A-Z]+)"
s = "_Z4SortiSt6vectorI7StudentSaIS0_EE"
m = re.search(pattern, s)
if m:
print(m.group(2)[0: int(m.group(1))])
Output
Sort
Using _Z6__comp7StudentS_ will return __comp
I am making a small project in python that lets you make notes then read them by using specific arguments. I attempted to make an if statement to check if the string has a comma in it, and if it does, than my python file should find the comma then find the character right below that comma and turn it into an integer so it can read out the notes the user created in a specific user-defined range.
If that didn't make sense then basically all I am saying is that I want to find out what line/bit of code is causing this to not work and return nothing even though notes.txt has content.
Here is what I have in my python file:
if "," not in no_cs: # no_cs is the string I am searching through
user_out = int(no_cs[6:len(no_cs) - 1])
notes = open("notes.txt", "r") # notes.txt is the file that stores all the notes the user makes
notes_lines = notes.read().split("\n") # this is suppose to split all the notes into a list
try:
print(notes_lines[user_out])
except IndexError:
print("That line does not exist.")
notes.close()
elif "," in no_cs:
user_out_1 = int(no_cs.find(',') - 1)
user_out_2 = int(no_cs.find(',') + 1)
notes = open("notes.txt", "r")
notes_lines = notes.read().split("\n")
print(notes_lines[user_out_1:user_out_2]) # this is SUPPOSE to list all notes in a specific range but doesn't
notes.close()
Now here is the notes.txt file:
note
note1
note2
note3
and lastly here is what I am getting in console when I attempt to run the program and type notes(0,2)
>>> notes(0,2)
jeffv : notes(0,2)
[]
A great way to do this is to use the python .partition() method. It works by splitting a string from the first occurrence and returns a tuple... The tuple consists of three parts 0: Before the separator 1: The separator itself 2: After the separator:
# The whole string we wish to search.. Let's use a
# Monty Python quote since we are using Python :)
whole_string = "We interrupt this program to annoy you and make things\
generally more irritating."
# Here is the first word we wish to split from the entire string
first_split = 'program'
# now we use partition to pick what comes after the first split word
substring_split = whole_string.partition(first_split)[2]
# now we use python to give us the first character after that first split word
first_character = str(substring_split)[0]
# since the above is a space, let's also show the second character so
# that it is less confusing :)
second_character = str(substring_split)[1]
# Output
print("Here is the whole string we wish to split: " + whole_string)
print("Here is the first split word we want to find: " + first_split)
print("Now here is the first word that occurred after our split word: " + substring_split)
print("The first character after the substring split is: " + first_character)
print("The second character after the substring split is: " + second_character)
output
Here is the whole string we wish to split: We interrupt this program to annoy you and make things generally more irritating.
Here is the first split word we want to find: program
Now here is the first word that occurred after our split word: to annoy you and make things generally more irritating.
The first character after the substring split is:
The second character after the substring split is: t
I'm a novice in python programming and i'm trying to split full name to first name and last name, can someone assist me on this ? so my example file is:
Sarah Simpson
I expect the output like this : Sarah,Simpson
You can use the split() function like so:
fullname=" Sarah Simpson"
fullname.split()
which will give you: ['Sarah', 'Simpson']
Building on that, you can do:
first=fullname.split()[0]
last=fullname.split()[-1]
print(first + ',' + last)
which would give you Sarah,Simpson with no spaces
This comes handly : nameparser 1.0.6 - https://pypi.org/project/nameparser/
>>> from nameparser import HumanName
>>> name = "Sarah Simpson"
>>> name = HumanName(name)
>>> name.last
'Simpson'
>>> name.first
'Sarah'
>>> name.last+', '+name.first
'Simpson, Sarah'
you can try the .split() function which returns a list of strings after splitting by a separator. In this case the separator is a space char.
first remove leading and trailing spaces using .strip() then split by the separator.
first_name, last_name=fullname.strip().split()
Strings in Python are immutable. Create a new String to get the desired output.
You can use split() method of string class.
name = "Sarah Simpson"
name.split()
split() by default splits on whitespace, and takes separator as parameter. It returns a list
["Sarah", "Simpson"]
Just concatenate the strings. For more reference https://docs.python.org/3.7/library/stdtypes.html?highlight=split#str.split
Output = "Sarah", "Simpson"
name = "Thomas Winter"
LastName = name.split()[1]
(note the parantheses on the function call split.)
split() creates a list where each element is from your original string, delimited by whitespace. You can now grab the second element using name.split()[1] or the last element using name.split()[-1]
split() is obviously the function to go for-
which can take a parameter or 0 parameter
fullname="Sarah Simpson"
ls=fullname.split()
ls=fullname.split(" ") #this will split by specified space
Extra Optional
And if you want the split name to be shown as a string delimited by coma, then you can use join() or replace
print(",".join(ls)) #outputs Sarah,Simpson
print(st.replace(" ",","))
Input: Sarah Simpson => suppose it is a string.
Then, to output: Sarah, Simpson. Do the following:
name_surname = "Sarah Simpson".split(" ")
to_output = name_surname[0] + ", " + name_surname[-1]
print(to_output)
The function split is executed on a string to split it by a specified argument passed to it. Then it outputs a list of all chars or words that were split.
In your case: the string is "Sarah Simpson", so, when you execute split with the argument " " -empty space- the output will be: ["Sarah", "Simpson"].
Now, to combine the names or to access any of them, you can right the name of the list with a square brackets containing the index of the desired word to return. For example: name_surname[0] will output "Sarah" since its index is 0 in the list.