debugger.py

import shutil
import inspect

prompt = lambda: input('debug>>> ')
disp_width = shutil.get_terminal_size().columns

def words_gen(lst, chunk):
    ans = list()
    while True:
        try:
            nxt = lst.pop(0)
        except IndexError:
            if ans:
                yield ans
            raise StopIteration
        else:
            ans.append(nxt)
        if len(ans) == chunk:
            yield ans
            ans = []
        else:
            continue
    return

def _pp(attr_list):
    if not attr_list:
        return ""
    slen = lambda w: len(w)+2
    cell_size = max(list(map(slen, attr_list)))
    cell_count = disp_width//cell_size
    for words in words_gen(attr_list, cell_count):
        words = list(words)
        word = words.pop(0)
        ans = format(word, f"<{cell_size}s")
        for word in words:
            ans += format(word, f"<{cell_size}s")
        print(ans)
    return "printed something"

def show(cntxt_dcn):
    keys = list(cntxt_dcn.keys())
    magic = list()
    others = list()
    for x in keys:
        if x.startswith('__') and x.endswith('__'):
            magic.append(x)
        else:
            others.append(x)
    if _pp(magic) + _pp(others):
        print('Whose value do you want to see?')
        k = prompt()
    else:
        k = -1
    try:
        cntxt_dcn[k]
    except KeyError:
        pass
    else:
        print('value of `%s` is--' % k)
        print(cntxt_dcn[k])
        _ = input('Press [Enter] to continue')
        print('_'*disp_width)
    return

def db():
    dbFrame = inspect.currentframe()
    fnFrame = dbFrame.f_back
    fnIntel = inspect.getframeinfo(fnFrame)

    file_ = fnIntel.filename
    fnName = fnIntel.function
    locals_ = fnFrame.f_locals
    globals_ = fnFrame.f_globals
    currLine = fnFrame.f_lineno
    
    while True:
        print("file: %s\nline: #%d\nfunction: %s()" % (file_, currLine, fnName))
        print("What would you like to see?")
        print('[l]ocals, [g]lobals or [q]uit')
        ch = prompt()
        if ch == 'l':
            show(locals_)
        elif ch == 'g':
            show(globals_)
        elif ch == 'q':
            break

    return




use vimrunner for CLI
use websockets+elm for browser based GUI