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How does Python string comparison _really_ work?


How does Python string comparison _really_ work?

By : Wuyu Huang
Date : November 21 2020, 03:00 PM
I think the issue was by ths following , From the docs (and frustratingly, not mentioned in the docs for the string type):
code :


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string/char comparison vs. bitwise comparison in python

string/char comparison vs. bitwise comparison in python


By : user3045432
Date : March 29 2020, 07:55 AM
this will help
Will converting characters to respective binary, and implementing minor neural networks using bitwise comparisons save processing time and memory consumption, as compared to simple character comparison?
Need String Comparison 's solution for Partial String Comparison in Python

Need String Comparison 's solution for Partial String Comparison in Python


By : user2938280
Date : March 29 2020, 07:55 AM
hop of those help? Since you want to compare only stem or "root word" of a given word, I suggest using some stemming algorithm. Stemming algorithms attempt to automatically remove suffixes (and in some cases prefixes) in order to find the "root word" or stem of a given word. This is useful in various natural language processing scenarios, such as search. Luckily there is a python package for stemming. You can download it from here.
Next you want to compare string without stop-words (a,an,the,from, etc.). So you need to filter these words before comparing strings. You can get a list of stop-words from internet or you can use nltk package to import stop-words list. You can get nltk from here
code :
['i', 'me', 'my', 'myself', 'we', 'our', 'ours', 'ourselves', 'you', 'your', 'yours',
 'yourself', 'yourselves', 'he', 'him', 'his', 'himself', 'she', 'her', 'hers', 'herself',
 'it', 'its', 'itself', 'they', 'them', 'their', 'theirs', 'themselves', 'what', 'which',
 'who', 'whom', 'this', 'that', 'these', 'those', 'am', 'is', 'are', 'was', 'were', 'be',
 'been', 'being', 'have', 'has', 'had', 'having', 'do', 'does', 'did', 'doing', 'a', 'an',
 'the', 'and', 'but', 'if', 'or', 'because', 'as', 'until', 'while', 'of', 'at', 'by', 'for',
 'with', 'about', 'against', 'between', 'into', 'through', 'during', 'before', 'after',
 'above', 'below', 'to', 'from', 'up', 'down', 'in', 'out', 'on', 'off', 'over', 'under',
 'again', 'further', 'then', 'once', 'here', 'there', 'when', 'where', 'why', 'how', 'all',
 'any', 'both', 'each', 'few', 'more', 'most', 'other', 'some', 'such', 'no', 'nor', 'not',
 'only', 'own', 'same', 'so', 'than', 'too', 'very', 's', 't', 'can', 'will', 'just', 'don',
 'should', 'now']
from stemming.porter2 import stem
from nltk.corpus import stopwords
stopwords_ =  stopwords.words('english')
def addString(x):
   flag = True
   y = [stem(j).lower() for j in x.split() if j.lower() not in stopwords_]
   for i in section:
      i = [stem(j).lower() for j in i.split() if j.lower() not in stopwords_]
      if y==i:
         flag = False
         break
   if flag:
      section.append(x)
      print "\tNew Section Added"
>>> from stemming.porter2 import stem
>>> from nltk.corpus import stopwords
>>> stopwords_ =  stopwords.words('english')
>>> 
>>> def addString(x):
...    flag = True
...    y = [stem(j).lower() for j in x.split() if j.lower() not in stopwords_]
...    for i in section:
...       i = [stem(j).lower() for j in i.split() if j.lower() not in stopwords_]
...       if y==i:
...          flag = False
...          break
...    if flag:
...       section.append(x)
...       print "\tNew Section Added"
... 
>>> section = [ "Activity (Last 3 Days)", "Activity (Last 7 days)", "Executable running from disk", "Actions from File"]  # initial Section list
>>> addString("Activity (Last 30 Days)")
    New Section Added
>>> addString("Executables running from disk")
>>> addString("Actions from a file")
>>> section
['Activity (Last 3 Days)', 'Activity (Last 7 days)', 'Executable running from disk', 'Actions from File', 'Activity (Last 30 Days)']  # Final section list
python: string comparison do not work as expected

python: string comparison do not work as expected


By : lucasjames92
Date : March 29 2020, 07:55 AM
this one helps. My program is like this: , Short answer:
if filename == "default" :
code :
def f():
    a = "foo"
    b = "foo"
    print(a is b)   # True, because a and b refer to the same constant
    x = "f" + "oo"
    print(a is x)   # True, because the addition is optimized away
    y = "f"
    z = y + "oo"    #
    print(a is z)   # False, because z is actually a different object
>>> import dis
>>> dis.dis(f)
2         0 LOAD_CONST               1 ('foo')
          3 STORE_FAST               0 (a)

3         6 LOAD_CONST               1 ('foo')
          9 STORE_FAST               1 (b)

4        ...

5        28 LOAD_CONST               4 ('foo')
         31 STORE_FAST               2 (x)

6        ...

7        50 LOAD_CONST               2 ('f')
         53 STORE_FAST               3 (y)

8        56 LOAD_FAST                3 (y)
         59 LOAD_CONST               3 ('oo')
         62 BINARY_ADD
         63 STORE_FAST               4 (z)

9        ...
String comparison does not work in python

String comparison does not work in python


By : h.shira
Date : March 29 2020, 07:55 AM
I hope this helps . As it turns out, your string has new-lines (\n\n) at the end.
You can use
code :
text = text.strip()
how does string comparison work on python?

how does string comparison work on python?


By : user4403827
Date : March 29 2020, 07:55 AM
will be helpful for those in need Lexigraphically.
The first bytes are compared and if the ordinal value of the first is less than of the second, it's lesser. If it's more, it's greater. If they are the same, the next byte is tried. If it's all ties and one is longer, the shorter one is lesser.
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