CODEWITHSUNDEEP
pythonlistsearchtext-extraction
Z.Grey
Z.Grey

Reputation: 164

Python Create a List file and write query

so sorry for my question if it seems so easy but I am newbie user of python and I can not find a way to solve it.

I have a "dish.py" file which includes some sub-lists

Fruits={"Ap":Apple
        "Br":Black Mulberry
        "Ch":Black Cherry
        }
Meals={"BN":Bean
        "MT":Meat
        "VG":Vegetable
        }
Legumes={"LN":Green Lentil
        "P": Pea
        "PN":Runner Peanut
        }

I want to impelement the dish.py file in a code that at the end, I want to create a query inside of the file 

with open("/home/user/Py_tut/Cond/dish.py", 'r') as dish:
           content = dish.read()
print dish.closed
dm=dict([dish])
nl=[x for x in dm if x[0]=='P']
for x in dm:
    x=str(raw_input("Enter word:"))
   if x in dm:
        print dm[x]
    elif x[0]==("P"):
        nl.append(x)
        print .join( nl)

It may be look so messy but

  1. dm=dict([dish]) I want to create a dictionary for query
  2. nl=[x for x in dm if x[0]=='P'] I want to write words begin with "P" letter

Here is my questions:

1. Q: I suppose there is a problem with my dish.py file. How can I reorganize it?

2. Q: How can I apply a query to the file and extract the words begin with "P" Thank you so much in advance

Upvotes: 0

Views: 119

Answers (2)

mths
mths

Reputation: 847

So I think you have more than these two issues/questions. First, if you want to include 'hardcoded' lists, dicts and such, you probably want to include dish with dish.py being in your working directory.

That is, if your data structures in the python file are actually in the correct form:

Fruits={"Ap":'Apple',
        "Br":'Black Mulberry',
        "Ch":'Black Cherry'
        }
Meals={"BN":'Bean',
        "MT":'Meat',
        "VG":'Vegetable'
        }
Legumes={"LN":'Green Lentil',
        "P":'Pea',
        "PN":'Runner Peanut'
        }

Finally, you can search in all the datastructures that were named and included in the file, under the created namespace of the include (which is dish).

for f in [dish.Fruits,dish.Meals,dish.Legumes]:
  for k,v in f.items():
    if k.startswith('P'):
      print k,v

Also interesting for you might be pickling (though there are some caveats).

Upvotes: 1

user6597761
user6597761

Reputation:

dict() can't load strings:

>>> dict("{'a': 1, 'b': 2}")
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
  dict("{'a': 1, 'b': 2}")
ValueError: dictionary update sequence element 0 has length 1; 2 is required

As a sequence it would be ("{", "'", "a", "'", ":",...

Instead I would use the json module, change the dish.py format (changing extension to .json and using JSON syntax) and change the code.

dish.json 

{
  "Fruits": {
     "Ap": "Apple",
     "Br": "Black Mulberry",
     "Ch": "Black Cherry"
  },
  "Meals": {
     "BN": "Bean",
     "MT": "Meat",
     "VG": "Vegetable"
  },
  "Legumes": {
     "GL": "Green Lentin",
     "P": "Pea",
     "PN": "Running Peanut"
  }
}

__init__.py 

import json
with open("/home/user/Py_tut/Cond/dish.py", 'r') as dish:
    content = dish.read()
print(dish.closed)
dm = json.loads(content) # loads JSON
nl=[x for x in dm if x[0]=='P']
for x in dm:
    x = str(raw_input("Enter word:"))
    if x in dm:
        print dm[x]
    elif x[0] == ("P"):
        nl.append(x)
        print "".join(nl)
  1. Q: How can I apply a query to the file and extract the words begin with "P" Thank you so much in advance

Assuming that you want to get every string separated by either space or newline and return them into a list, i'd do this:

import re #Importing RegExp module

def wordsBeginP():
  with open("words.txt") as wordsfile: # Querying a file
    words = wordsfile.open

  parsed = re.sub(r"\n", " ", words) # Replace \n to " "
  return [for i in parsed.split(" ") if i[0] == "P"] # Return list of words

Upvotes: 1

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