javascript - Python - convert csv file to JSON

Question

I need to convert a csv file into a hierarchical JSON object (preferably using Python). I thought that the script I have (below) does a correct job of converting to JSON, but the JavaScript library I'm feeding the JSON data to (D3.js) doesn't work with it.

The csv file looks like this:

subject,branch,book,chapter,Encode ID,Level 1,Level 2,Level 3,Level 4
MAT,TRI,CK-12 Trigonometry - Second Edition,Right Triangles and an Introduction to Trigonometry,MAT.TRI.000,Right Triangles and an Introduction to Trigonometry,,,
MAT,TRI,CK-12 Trigonometry - Second Edition,Right Triangles and an Introduction to Trigonometry,MAT.TRI.004,,The Pythagorean Theorem,,
MAT,TRI,CK-12 Trigonometry - Second Edition,Right Triangles and an Introduction to Trigonometry,MAT.TRI.005,,,The Pythagorean Theorem,
MAT,TRI,CK-12 Trigonometry - Second Edition,Right Triangles and an Introduction to Trigonometry,MAT.TRI.006,,,Pythagorean Triples,
MAT,TRI,CK-12 Trigonometry - Second Edition,Right Triangles and an Introduction to Trigonometry,MAT.TRI.007,,,Converse of the Pythagorean Theorem,
MAT,TRI,CK-12 Trigonometry - Second Edition,Right Triangles and an Introduction to Trigonometry,MAT.TRI.008,,,The Distance Formula,
MAT,TRI,CK-12 Trigonometry - Second Edition,Right Triangles and an Introduction to Trigonometry,MAT.TRI.009,,Special Right Triangles,,

Right now, I have the following code the recursively builds the hierarchical array:

import csv
import json
import random

random.seed()

# open up the csv file
f = open('/path/to/file','rU')
c = csv.DictReader(f)

# lists for keeping track of what subjects and branches I've already iterated over
subject_list = []
branch_list = []
lev1_list = []
lev2_list = []
lev3_list = []
lev4_list = []

# iterate through file
i = 0
for row in c:
    if i == 0:
        subject = row['subject']
        branch = row['branch']
        if len(row['Level 1']) > 0:
            lev1 = row['Level 1']
        else:
            lev2 = None
        if len(row['Level 2']) > 0:
            lev2 = row['Level 2']
        else:
            lev2 = None
        if len(row['Level 3']) > 0:
            lev3 = row['Level 3']
        else:
            lev3 = None

    else:
        if row['subject'] != subject:

            # add all branches to this subject
            subject_list.append({'name':subject,'type':'subject','children':branch_list})


            # set current subject
            subject = row['subject']

        if row['branch'] != branch:
            # add all concepts to this branch
            branch_list.append({'name':branch,'type':'branch','children':lev1_list})

            # empty lev1_list
            lev1_list = []

            # set new branch
            branch = row['branch']

        if len(row['Level 1']) > 0 and row['Level 1'] != lev1:
            # print lev1
            # add all level 2 concepts to this level 1
            lev1_list.append({'name':lev1,'type':'concept','level':1,'children':lev2_list})
            #print lev1
            #empty lev2_list
            lev2_list = []

            #lev1_list.append(row['Level 1'])
            lev1 = row['Level 1']

        if len(row['Level 2']) > 0 and row['Level 2'] != lev3:
            #print lev2
            #print lev3_list
            # add all level 3 concepts to this level 2
            if lev2 is not None:
                lev2_list.append({'name':lev2,'type':'concept','level':2,'children':lev3_list})

            # empty lev3_list
            lev3_list = []

            # lev2_list.append(row['Level 2'])
            lev2 = row['Level 2']

        if len(row['Level 3']) > 0 and row['Level 3'] != lev3:
            # print lev3
            # add all level 4 concepts to this level 4
            # lev3_list.append({'name':lev3,'type':'concept','level':3})

            # empty level 4 concepts
            # lev4_list = []

            # add new level 3
            if lev3 is not None:
                lev3_list.append({'name':lev3,'type':'concept','level':3,'size':random.randint(1,100)})
            lev3 = row['Level 3']


        #if row['Level 4'] is not None and row['Level 4'] is not lev4:
        #   lev4_list.append({'name':lev4,'type':'concept','level':4})
        #   lev4 = row['Level 4']

    i += 1

f.close()


branch_list.append({'name':branch,'type':'branch','children':lev1_list})

#subject_list.append({'name':subject,'type':'subject','children':branch_list})
subject_dict = {'name':subject,'type':'subject','children':branch_list}

#json_list= json.dumps(subject_list)
json_list = json.dumps(subject_dict)

f = open('/Users/thaymore/Sites/d3/data/trig_map.json','wb')
f.write(json_list)
f.close()

What this gets me right now is something like this:

{"type": "subject", "name": "MAT", "children": [{"type": "branch", "name": "TRI", "children": [{"children": [{"children": [{"size": 40, "type": "concept", "name": "The Pythagorean Theorem", "level": 3}, {"size": 19, "type": "concept", "name": "Pythagorean Triples", "level": 3}, {"size": 68, "type": "concept", "name": "Converse of the Pythagorean Theorem", "level": 3}], "type": "concept", "name": "The Pythagorean Theorem", "level": 2}, {"children": [{"size": 28, "type": "concept", "name": "The Distance Formula", "level": 3}, {"size": 49, "type": "concept", "name": "Special Right Triangle #1: Isosceles Right Triangle", "level": 3}, {"size": 33, "type": "concept", "name": "Special Right Triangle #2: 30-60-90 Triangle", "level": 3}], "type": "concept", "name": "Special Right Triangles", "level": 2}, {"children": [{"size": 18, "type": "concept", "name": "Using Special Right Triangle Ratios", "level": 3}, {"size": 49, "type": "concept", "name": "The Sine, Cosine, and Tangent Functions", "level": 3}], "type": "concept", "name": "Basic Trigonometric Functions", "level": 2}, {"children": [{"size": 100, "type": "concept", "name": "Secant, Cosecant, and Cotangent Functions", "level": 3}, {"size": 73, "type": "concept", "name": "Solving Right Triangles", "level": 3}, {"size": 93, "type": "concept", "name": "Inverse Trigonometric Functions", "level": 3}, {"size": 88, "type": "concept", "name": "Finding the Area of a Triangle", "level": 3}, {"size": 6, "type": "concept", "name": "Angles of Elevation and Depression", "level": 3}, {"size": 3, "type": "concept", "name": "Right Triangles and Bearings", "level": 3}], "type": "concept", "name": "Solving Right Triangles", "level": 2}, {"children": [{"size": 68, "type": "concept", "name": "Other Applications of Right Triangles", "level": 3}, {"size": 92, "type": "concept", "name": "Angles of Rotation in Standard Position", "level": 3}], "type": "concept", "name": "Measuring Rotation", "level": 2}, {"children": [{"size": 14, "type": "concept", "name": "Coterminal Angles", "level": 3}, {"size": 68, "type": "concept", "name": "Trigonometric Functions of Angles in Standard Position", "level": 3}], "type": "concept", "name": "Applying Trig Functions to Angles of Rotation", "level": 2}, {"children": [{"size": 61, "type": "concept", "name": "The Unit Circle", "level": 3}, {"size": 95, "type": "concept", "name": "Reference Angles and Angles in the Unit Circle", "level": 3}, {"size": 11, "type": "concept", "name": "Trigonometric Functions of Negative Angles", "level": 3}, {"size": 45, "type": "concept", "name": "Trigonometric Functions of Angles Greater than 360 Degrees", "level": 3}], "type": "concept", "name": "Trigonometric Functions of Any Angle", "level": 2}], "type": "concept", "name": "Right Triangles and an Introduction to Trigonometry", "level": 1}, {"children": [{"children": [{"size": 20, "type": "concept", "name": "Using a Calculator to Find Values", "level": 3}, {"size": 25, "type": "concept", "name": "Reciprocal identities", "level": 3}, {"size": 40, "type": "concept", "name": "Domain, Range, and Signs of Trig Functions", "level": 3}, {"size": 97, "type": "concept", "name": "Quotient Identities", "level": 3}, {"size": 18, "type": "concept", "name": "Cofunction Identities and Reflection", "level": 3}], "type": "concept", "name": "Relating Trigonometric Functions", "level": 2}, {"children": [{"size": 35, "type": "concept", "name": "Pythagorean Identities", "level": 3}, {"size": 95, "type": "concept", "name": "Understanding Radian Measure", "level": 3}, {"size": 30, "type": "concept", "name": "Critial Angles in Radians", "level": 3}, {"size": 16, "type": "concept", "name": "Converting Any Degree to Radians", "level": 3}, {"size": 25, "type": "concept", "name": "The Six Trig Functions and Radians", "level": 3}], "type": "concept", "name": "Radian Measure", "level": 2}, {"children": [{"size": 19, "type": "concept", "name": "Check the Mode", "level": 3}, {"size": 63, "type": "concept", "name": "Rotations", "level": 3}, {"size": 33, "type": "concept", "name": "Length of Arc", "level": 3}, {"size": 54, "type": "concept", "name": "Area of a Sector", "level": 3}, {"size": 6, "type": "concept", "name": "Length of a Chord", "level": 3}], "type": "concept", "name": "Applications of Radian Measure", "level": 2}, {"children": [{"size": 71, "type": "concept", "name": "Angular Velocity", "level": 3}, {"size": 16, "type": "concept", "name": "The Sine Graph", "level": 3}, {"size": 65, "type": "concept", "name": "The Cosine Graph", "level": 3}, {"size": 32, "type": "concept", "name": "The Tangent Graph", "level": 3}, {"size": 93, "type": "concept", "name": "The Three Reciprocal Functions", "level": 3}, {"size": 30, "type": "concept", "name": "Cotangent", "level": 3}, {"size": 4, "type": "concept", "name": "Cosecant", "level": 3}], "type": "concept", "name": "Circular Functions of Real Numbers", "level": 2}, {"children": [{"size": 100, "type": "concept", "name": "Secant", "level": 3}, {"size": 40, "type": "concept", "name": "Vertical Translations", "level": 3}], "type": "concept", "name": "Translating Sine and Cosine Functions", "level": 2}, {"children": [{"size": 58, "type": "concept", "name": "Horizontal Translations or Phase Shifts", "level": 3}, {"size": 76, "type": "concept", "name": "Amplitude", "level": 3}, {"size": 91, "type": "concept", "name": "Period and Frequency", "level": 3}], "type": "concept", "name": "Amplitude, Period and Frequency", "level": 2}, {"children": [{"size": 78, "type": "concept", "name": "Combining Amplitude and Period", "level": 3}, {"size": 12, "type": "concept", "name": "The Generalized Equations", "level": 3}, {"size": 22, "type": "concept", "name": "Drawing Sketches/Identifying Transformations from the Equation", "level": 3}], "type": "concept", "name": "General Sinusoidal Graphs", "level": 2}], "type": "concept", "name": "Graphing Trigonometric Functions - 2nd edition", "level": 1}, {"children": [{"children": [{"size": 81, "type": "concept", "name": "Writing the Equation from a Sketch", "level": 3}, {"size": 60, "type": "concept", "name": "Tangent and Cotangent", "level": 3}, {"size": 27, "type": "concept", "name": "Secant and Cosecant", "level": 3}], "type": "concept", "name": "Graphing Tangent, Cotangent, Secant, and Cosecant", "level": 2}, {"children": [{"size": 62, "type": "concept", "name": "Graphing Calculator Note", "level": 3}, {"size": 20, "type": "concept", "name": "Quotient Identity", "level": 3}, {"size": 15, "type": "concept", "name": "Reciprocal Identities", "level": 3}, {"size": 28, "type": "concept", "name": "Pythagorean Identity", "level": 3}, {"size": 28, "type": "concept", "name": "Even and Odd Identities", "level": 3}], "type": "concept", "name": "Fundamental Identities", "level": 2}, {"children": [{"size": 24, "type": "concept", "name": "Cofunction Identities", "level": 3}, {"size": 91, "type": "concept", "name": "Working with Trigonometric Identities", "level": 3}], "type": "concept", "name": "Proving Identities", "level": 2}, {"childr

Answer 1

Wouldn't this work?

import json

f = open('path/to/file','r')

arr=[]
headers = []

for header in f.readline().split(','):
  headers.append(header)

for line in f.readlines():
  lineItems = {}
  for i,item in enumerate(line.split(',')):  
    lineItems[headers[i]] = item
  arr.append(lineItems)

f.close()

jsonText = json.dumps(arr)

print jsonText