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I would like to understand if there is a difference between assigning an empty value and an empty output, as follows:
1> Assigning a value like this
string = ""
2> An empty value returned as output
string = "abcd:"
str1, str2 = split(':')
In other words, is there a difference in values of 'string' in 1> and 'str2' in 2>? And how would a method see the value of 'str2' if it is passed as an argument?
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To initialize an empty string, we can use the string literal syntax double quotation marks "" in Python.
In C#, you can use strings as an array of characters, However, more common practice is to use the string keyword to declare a string variable. The string keyword is an alias for the System. String class. To declare an empty string.
Use len to Check if a String in Empty in Python # Using len() To Check if a String is Empty string = '' if len(string) == 0: print("Empty string!") else: print("Not empty string!") # Returns # Empty string! Keep in mind that this only checks if a string is truly empty.
NULL or Empty String: Which One to Use An empty string is a string instance of zero length. However, a NULL has no value at all. We can use a test database and apply the knowledge in the production environment to understand the concept better.
Checking equality with ==
>>> string = ""
>>> s = "abcd:"
>>> str1, str2 = s.split(':')
>>> str1
'abcd'
>>> str2
''
>>> str2 == string
True
Maybe you were trying to compare with is. This is for testing identity: a is b is equivalent to id(a) == id(b).
Or check both strings for emptiness:
>>> not str2
True
>>> not string
True
>>>
So that both are empty ...
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