validation

gistfile1.py

from pprint import pprint



def check_int(x):
    '''probably want to work out how to deal with floats as well'''
    '''but this is just proof of concept'''
    try:
        int(x)
        return True, x
    except ValueError:
        return False, '=int("{}")'.format(x)

def check_lessthan(x,y):
    if x<y:
        return True, x
    return False, '="Error: {} should be less than {}"'.format(x,y)
    
print(check_int(5))
print(check_int('word'))

'''let's make a simple 3x3 table'''

table=[[0 for a in range(3)] for b in range(3)]
table[0][1] = 4
table[1][1] = 6
table[2][1] = 'word'


'''now lets create an list of checks'''
'''check[x] will be the validation function(s) for column x'''

checks = [[] for _ in range(3)]

'''ok, validation for second column, confirm its an int'''

checks[1].append(check_int)
''' and less than 5'''
checks[1].append(lambda x:check_lessthan(x,5))

for check in checks[1]:
    for row in table:
        ok, row[1]=check(row[1])
        if not ok:
            break # Note it checks int before it does value comparison!

pprint(table)