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Empty strings are "falsy" (python 2 or python 3 reference), which means they are considered false in a Boolean context, so you can just do this: if not myString: This is the preferred way if you know that your variable is a string. If your variable could also be some other type then you should use: if myString == "":
Let’s see two different methods of checking if string is empty or not: Method #1 : Using Len () Using Len () is the most generic method to check for zero-length string. Even though it ignores the fact that a string with just spaces also should be practically considered as an empty string even its non-zero. Method #2 : Using not.
3. "" represents an empty string. So begin != "" is true whenever begin doesn't contain an empty string. The initial value None is not an empty string, so the loop will run at least once. After that, begin will contain whatever the user entered in response to the Begin: prompt.
The best and most convenient method for creating a string array in python is with the help of NumPy library. Example: import numpy as np. arr = np.chararray((rows, columns)) This will create an array having all the entries as empty strings. You can then initialize the array using either indexing or slicing.
Keep in mind that if you want to keep the white spaces within a string, you may remove them unintentionally using some approaches. If you have this list ['hello world', ' ', '', 'hello'] what you may want ['hello world','hello'] first trim the list to convert any type of white space to empty string: space_to_empty = [x.strip() for x in _text_list]
All string characters are unicode literal in Python 3; as a consequence, since str.split() splits on all white space characters, that means it splits on unicode white space characters. So split + join syntax (as in 1 , 2 , 3 ) will produce the same output as re.sub with the UNICODE flag (as in 4 ); in fact, the UNICODE flag is redundant here ...
You could initialise it with an empty string barfoo = "", which would result in hi after appending h and i. However, by assigning the empty string to the variable barfoo, you are defining the variable. I think "I want to initialize a string but not define it" is xXIronmanXx 's way of saying that he wants "an empty string" (or initialize barfoo ...
17. Another way to initialize an empty string is by using the built-in str() function with no arguments. str (object='') Return a string containing a nicely printable representation of an object. ... If no argument is given, returns the empty string, ''. In the original example, that would look like this: def __init__(self, mystr=str()) self ...
s = s.rstrip() For whitespace on the left side, use str.lstrip: s = s.lstrip() You can provide an argument to strip arbitrary characters to any of these functions, like this: s = s.strip(' \t\n\r') This will strip any space, \t, \n, or \r characters from both sides of the string. The examples above only remove strings from the left-hand and ...
The strip () in the last part s.strip ("\r\n").strip () and s.strip () is what actually removes the spaces in newlines and newlines. COMMAND REMOVE ALL BLANK LINES (BUT NOT ONES WITH SPACES): Technically lines with spaces should NOT be considered empty, but it all depends on the use case and what your trying to achieve.