moderate26.py

from msvcrt import getche

s = '0'
curr = ''

while True:
    print('\nPRESS "Q" To EXIT')
    try: e = eval(s) 
    except: e = eval(s[:-1])  
    
    print(f'\n{ e } ( {s} )')

    curr = getche().decode()
    # curr = input('exp :- ')
    
    # if curr in ['/','*','-','+']: curr += getche().decode()
    if curr.lower() == 'q': break
    elif curr.lower() == 'c': s = '0'
    elif s=='0' and curr: s = curr
    else: s+=curr