I found a related question right here on SO, but that question is about PHP though, and it states the b is used to indicate the string is binary, as opposed to Unicode, which was needed for code to be compatible from version of PHP 6, when migrating to PHP 6. I don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t think this applies to Python.
I did find this documentation on the Python site about using a u character in the same syntax to specify a string as Unicode. Unfortunately, it doesn''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t mention the b character anywhere in that document.
a++ and ++a both increment a by 1. The difference is that a++ returns the value of a before the increment whereas ++a returns the value after the increment.
a++ is postfix increment and ++a is prefix increment. They do not differ when used in a standalone statement, however their evaluation result differs: a++ returns the value of a before incrementing, while ++a after. I.e.
You can either use array declaration or array literal (but only when you declare and affect the variable right away, array literals cannot be used for re-assigning an array).
The third way of initializing is useful when you declare an array first and then initialize it, pass an array as a function argument, or return an array. The explicit type is required.
Of course this is an assignment, not a declaration. There''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s no way to say in Python "this variable should never refer to anything other than a list", since Python is dynamically typed.
* The default built-in Python type is called a list , not an array. It is an ordered container of arbitrary length that can hold a heterogenous collection of objects (their types do not matter and can be freely mixed). This should not be confused with the array module , which offers a type closer to the C array type; the contents must be homogenous (all of the same type), but the length is still dynamic.
Is there a way to specify the types while converting the list to DataFrame? Or is it better to create the DataFrame first and then loop through the columns to change the dtype for each column? Ideally I would like to do this in a dynamic way because there can be hundreds of columns, and I don''''''''''''''''''''''''''''''''t want to specify exactly which columns are of which type. All I can guarantee is that each column contains values of the same type.
to_numeric() - provides functionality to safely convert non-numeric types (e.g. strings) to a suitable numeric type. (See also to_datetime() and to_timedelta().)
Here you have a couple of options. If you know from context which variables you want to slice out, you can just return a view of only those columns by passing a list into the __getitem__ syntax (the []''''''''''''''''s).
Alternatively, if it matters to index them numerically and not by their name (say your code should automatically do this without knowing the names of the first two columns) then you can do this instead:
send_emails.go:171: smtp error: 535 5.7.8 Username and Password not accepted. Learn more at 5.7.8 https://support.google.com/mail/?p=BadCredentials a7sm5381413wmh.14 - gsmtp contact.go:38: error seding contact us form 535 5.7.8 Username and Password not accepted.
Despite the fact that the credentials of [email protected] are correct and I have enabled Allow less secure apps on [email protected].
You don''''t need to check hasOwnProperty when iterating on keys if you''''re using a simple object (for example one you made yourself with {} ).
If you want to do it in chunks , the best is to extract the keys in an array. As the order isn''''t guaranteed, this is the proper way. In modern browsers, you can use
Consider creating a byte object by typing a byte literal (literally defining a byte object without actually using a byte object e.g. by typing b'''') and converting it into a string object encoded in utf-8. (Note that converting here means decoding )
On python 3.6 with django 2.0, decode on a byte literal does not work as expected. Yes I get the right result when I print it, but the b''value'' is still there even if you print it right.
This shows that the function / method / class you're defining after a decorator is just basically passed on as an argument to the function / method immediately after the @ sign.
In Python 3.5 you can overload @ as an operator. It is named as __matmul__ , because it is designed to do matrix multiplication, but it can be anything you want. See PEP465 for details.
