CODEWITHSUNDEEP
pythoncase-sensitive
Drik Drik
Drik Drik

Reputation: 71

How to avoid case sensitivity in Python

I have this code and want to compare two lists.

list2= [('Tom','100'),('Alex','200')]
list3= [('tom','100'),('alex','200')]

non_match = []
for line in list2:
    if line not in list3:
       non_match.append(line)

print(non_match)

The results will be:

[('Tom', '100'), ('Alex', '200')]

because of case sensitivity! is there any way to avoid the case sensitivity in this case? I don't want to change the lists to upper or lower case.

Or any other method which can match these lists?

Upvotes: 2

Views: 2586

Answers (5)

Drik Drik
Drik Drik

Reputation: 71

This worked for me! Both lists will be converted to lower case.

list2= [('Tom','100'),('Alex','200'),('Tom', '13285')]
list3= [('tom','100'),('ALex','200'),('Tom', '13285')]


 def make_canonical(line):
     name, number = line
     return (name.lower(), number)

 list22 = []
 for line2 in list2:
    search = make_canonical(line2)
    list22.append(search)


 list33 =[]
 for line3 in list3:
     search1 = make_canonical(line3)
     list33.append(search1)


 non_match = []
 for line in list22:
     if line not in list33:
        non_match.append(line)


 print(non_match)

Upvotes: 0

Patrick Artner
Patrick Artner

Reputation: 51643

You can make the comparison even more generic mixing ints and whitespaces in the game by creating two dicts from your tuple-lists and compare the lists:

def unify(v):
    return str(v).lower().strip()


list2= [('Tom    ','100'),('    AleX',200)]
list3= [('toM',100),('aLex  ','200')]

d2 = {unify(k):unify(v) for k,v in list2}  # create a dict
d3 = {unify(k):unify(v) for k,v in list3}  # create another dict

print(d2 == d3)  # dicts compare (key,value) wise

The applied methods will make strings from integers, strip whitespaces and then compare the dicts.

Output:

True

Upvotes: 0

Siva
Siva

Reputation: 569

Using lower to convert the tuple to lower case for comparison

list2= [('Tom','100'),('Alex','200')]
list3= [('tom','100'),('alex','200')]

non_match = []
for line in list2:
    name, val = line
    if (name.lower(), val) not in list3:
        non_match.append(line)

print(non_match)

Upvotes: 3

Bhushan Uniyal
Bhushan Uniyal

Reputation: 5703

You need to iterate tuples also inside loop

for line2 in list2:   
    for line3 in list3:
        if len(line3) == len(line2):
        lenth = len(line3)
            successCount = 0
        match = False
        for i in range(lenth):
            result = line2[i].lower() == line3[i].lower()
        if result == True:
            successCount = successCount +1;
            result = False
            if successCount == lenth:
            non_match.append(line2)




print(non_match)

enjoy.....

Upvotes: 0

Hannes Ovrén
Hannes Ovrén

Reputation: 21831

You can't avoid transforming your data to some case-insensitive format, at some point. What you can do is to avoid recreating the full lists:

def make_canonical(line):
    name, number = line
    return (name.lower(), number)

non_match = []
for line2 in list2:
    search = make_canonical(line2)
    for line3 in list3:
        canonical = make_canonical(line3)
        if search == canonical:
            break
    else:
        # Did not hit the break
        non_match.append(line3)

Upvotes: 0

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