Run selected lines of a Python Script on CMD

Open the parent script in an interpreter like PyCharm and select the lines you want to execute & then right click -> Execute selection in console.

It would theoretically be possible with a bit of work, however please note that this is not how scripts work in general. Instead, you should consider grouping coherent routine sequences into named functions, and call them from command line.

Among other issues, you'll have to modify all calling code to your script every time you shift the line numbers, you'll have to repeat any imports any subsection would potentially need and it's generally not a good idea. I am still going to address it after I make a case for refactoring though...

Refactoring the script and calling specific functions

Consider this answer to Python: Run function from the command line

Your python script:

import numpy as np
from six.moves import range
from six.moves import cPickle as pickle

def load_data()
    pickle_file = "C:\\A.pickle"

    with open(pickle_file, 'rb') as f:
        data = pickle.load(f, encoding ='latin1')

    train_dataset = data['train_dataset']
    test_dataset = data['test_dataset']
    valid_dataset = data['valid_dataset']
    train_labels = data['train_labels']
    test_labels = data['test_labels']
    valid_labels = data['valid_labels']

def main():
    a = 28
    b = 1

    def reformat(dataset, labels):
        dataset = dataset.reshape(-1, a, a, b).astype(np.float32)
        labels = (np.arange(10)==labels[:,None]).astype(np.float32)
        return dataset, labels

    train_dataset, train_labels = reformat(train_dataset, train_labels)
    test_dataset, test_labels = reformat(test_dataset, test_labels)
    valid_dataset, valid_labels = reformat(valid_dataset, valid_labels)

Your cmd code would look like this:

REM
REM any logic to identify which function to call
REM

python -c "import myMasterDummyScript; myMasterDummyScript.load_data()"

It also enables you to pass arguments from cmd into the function call.

Now if you're really adamant about running an arbitrary subset of lines from an overall python script...

How to run specific lines from a script in cmd

cmd to read those lines out of the original script and write them to a temporary script Look at a proposed answer for batch script - read line by line. Adapting it slightly without so much of error management (which would significantly bloat this answer):

@echo off
@enabledelayedexpansion

SET startline=$1
SET endline=$2
SET originalscript=$3

SET tempscript=tempscript.py
SET line=1

REM erase tempscript
echo. > %tempscript%

for /f "tokens=*" %%a in (%originalscript%) do (
  if %line% GEQ %startline% (
      if %line% LEQ %endline% (
          echo %%a >> %tempscript%
      )
  )
  set /a line+=1
)

python %tempscript%
pause

You'd call it like this:

C:\> runlines.cmd 1 16 myMasterDummyScript.py

You could use the command line debugger pdb. As an example, given the following script:

print('1')
print('2')
print('3')
print('4')
print('5')
print('6')
print('7')
print('8')
print('9')
print('10')
print('11')
print('12')
print('13')
print('14')
print('15')

Here's a debug session that runs only lines 5-9 by jumping to line 5, setting a breakpoint at line 10, gives a listing to see the current line to be executed and breakpoints, and continuing execution. Type help to see all the commands available.

C:\>py -m pdb test.py
> c:\test.py(1)<module>()
-> print('1')
(Pdb) jump 5
> c:\test.py(5)<module>()
-> print('5')
(Pdb) b 10
Breakpoint 1 at c:\test.py:10
(Pdb) longlist
  1     print('1')
  2     print('2')
  3     print('3')
  4     print('4')
  5  -> print('5')
  6     print('6')
  7     print('7')
  8     print('8')
  9     print('9')
 10 B   print('10')
 11     print('11')
 12     print('12')
 13     print('13')
 14     print('14')
 15     print('15')
(Pdb) cont
5
6
7
8
9
> c:\test.py(10)<module>()
-> print('10')
(Pdb)

Option 1 - You can use a debugger to know everything in any moment of the code execution. (python -m pdb myscript.py debug your code too)

Option 2 - You can create a main file and a sub-files with your pieces of scripts and import in the main script and execute the main file or any separated file to test

Option 3 - You can use arguments (Using the argparse for example)

I've not more options at the moment