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I have a routine that takes a list of strings as a parameter, but I'd like to support passing in a single string and converting it to a list of one string. For example:
def func( files ): for f in files: doSomethingWithFile( f ) func( ['file1','file2','file3'] ) func( 'file1' ) # should be treated like ['file1'] How can my function tell whether a string or a list has been passed in? I know there is a type function, but is there a "more pythonic" way?
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Given an object, the task is to check whether the object is list or not. if isinstance (ini_list1, list ): print ( "your object is a list !" )
Use the typeof operator to check if a variable is a string, e.g. if (typeof variable === 'string') . If the typeof operator returns "string" , then the variable is a string. In all other cases the variable isn't a string. Copied!
To check if a variable contains a value that is a string, use the isinstance built-in function. The isinstance function takes two arguments. The first is your variable. The second is the type you want to check for.
To get the type of a variable in Python, you can use the built-in type() function. In Python, everything is an object. So, when you use the type() function to print the type of the value stored in a variable to the console, it returns the class type of the object.
isinstance(your_var, basestring) Well, there's nothing unpythonic about checking type. Having said that, if you're willing to put a small burden on the caller:
def func( *files ): for f in files: doSomethingWithFile( f ) func( *['file1','file2','file3'] ) #Is treated like func('file1','file2','file3') func( 'file1' ) I'd argue this is more pythonic in that "explicit is better than implicit". Here there is at least a recognition on the part of the caller when the input is already in list form.
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