Compare two strings, compare two lists in python

In Python, you can easily compare two strings or two lists using comparison operators such as ==, !=, <, >, <=, and >=. Let's see how to compare strings and lists in Python.

Comparing two strings:

You can compare two strings using the == (equality) operator to check if they are equal or the != (inequality) operator to check if they are not equal. Python compares strings lexicographically, which is similar to alphabetical order but takes into account all characters' Unicode code points.

str1 = "hello"
str2 = "world"
str3 = "hello"

print(str1 == str2)  # Output: False
print(str1 == str3)  # Output: True
print(str1 != str2)  # Output: True

You can also use other comparison operators like <, >, <=, >= to compare strings lexicographically.

print(str1 < str2)   # Output: True
print(str1 > str2)   # Output: False

Comparing two lists:

Similar to strings, you can compare two lists using the == (equality) operator to check if they are equal or the != (inequality) operator to check if they are not equal. Lists are compared element-wise, in the same order.

list1 = [1, 2, 3]
list2 = [1, 2, 3]
list3 = [1, 2, 4]

print(list1 == list2)  # Output: True
print(list1 == list3)  # Output: False
print(list1 != list3)  # Output: True

Again, you can use other comparison operators like <, >, <=, >= to compare lists lexicographically.

list4 = [1, 2]
list5 = [1, 2, 3]

print(list4 < list5)   # Output: True
print(list4 > list5)   # Output: False

Note that when comparing lists or strings, both types must be the same. Comparing a string to a list will result in a TypeError.

Python compare two strings:

str1 = "Hello"
str2 = "World"
result = str1 == str2
print(result)  # False

String comparison operators in Python:

str1 = "Hello"
str2 = "World"
result = str1 < str2
print(result)  # True (lexicographical order)

Case-insensitive string comparison in Python:

str1 = "hello"
str2 = "HELLO"
result = str1.lower() == str2.lower()
print(result)  # True

Levenshtein distance for string similarity in Python: (Requires the python-Levenshtein library)

import Levenshtein

str1 = "kitten"
str2 = "sitting"
distance = Levenshtein.distance(str1, str2)
similarity = 1 - distance / max(len(str1), len(str2))
print(similarity)  # 0.5714285714285714

Comparing two strings with difflib in Python:

import difflib

str1 = "Hello"
str2 = "World"
d = difflib.Differ()
diff = list(d.compare(str1, str2))
print(diff)
# Output: ['  H', '  e', '  l', '  l', '  o', '- W', '- o', '- r', '- l', '- d']

Fuzzy string matching in Python: (Requires the fuzzywuzzy library)

from fuzzywuzzy import fuzz

str1 = "Hello"
str2 = "World"
similarity_ratio = fuzz.ratio(str1, str2)
print(similarity_ratio)  # 20

Compare Unicode strings in Python:

str1 = "���"
str2 = "���"
result = str1 == str2
print(result)  # True

List Comparison:

Python compare two lists:

list1 = [1, 2, 3]
list2 = [4, 5, 6]
result = list1 == list2
print(result)  # False

Element-wise list comparison in Python:

list1 = [1, 2, 3]
list2 = [4, 5, 6]
result = all(x == y for x, y in zip(list1, list2))
print(result)  # False

Case-insensitive list comparison in Python:

list1 = ["apple", "Banana", "Cherry"]
list2 = ["Apple", "banana", "cherry"]
result = all(x.lower() == y.lower() for x, y in zip(list1, list2))
print(result)  # True

Check if lists have common elements in Python:

list1 = [1, 2, 3]
list2 = [3, 4, 5]
result = any(x in list2 for x in list1)
print(result)  # True

Find differences between two lists in Python:

list1 = [1, 2, 3]
list2 = [3, 4, 5]
diff = list(set(list1) - set(list2))
print(diff)  # [1, 2]

Comparing nested lists in Python:

nested_list1 = [[1, 2], [3, 4]]
nested_list2 = [[1, 2], [3, 4]]
result = nested_list1 == nested_list2
print(result)  # True