Welcome ! hope this blog make you unconstrained!

The core part of script is marked as red and comments are in blue.
# commands to get library file stored in abaqus

from abaqus import *
from abaqusConstants import *
backwardCompatibility.setValues(includeDeprecated=True,
                                reportDeprecated=False)
import sketch
import part
# creating variables by calling the constructors 
myModel = mdb.Model(name='Model A')

mySketch = myModel.ConstrainedSketch(name='Sketch A',
                                     sheetSize=200.0)

lines = open('redmodel.txt', 'r').readlines()      
#give your text file here. readlines() function reads all lines #from the given .txt file

pointList = []                                                 #Creating empty array

for line in lines:                                             
#reading line by line and performing action                       

    pointList.append( eval( '(%s)' % line.strip() ) )  
#strip() func removes all the white spaces from a line. #eval function which evaluates a string as though it were 
#an expression and returns a result and append adds each coordinate 
# as last element of array  

for i in range(len(pointList)-1):
    mySketch.Line(point1=pointList[i],
        point2=pointList[i+1])

# Above for loop will help in connecting the coordinates in the
# sequence  

myPart = myModel.Part(name='Part A', dimensionality=THREE_D,
    type=DEFORMABLE_BODY)

myPart.BaseSolidExtrude(sketch=mySketch, depth=20.0)

myViewport = session.Viewport(name='Viewport for Model A',
    origin=(10, 10), width=150, height=100)

myViewport.setValues(displayedObject=myPart)


Note: make sure that given .txt file is available in your set working directory.