Requirements.txt greater than equal to and then less than?

I have this line in my requirements file

django>=1.10,<1.11

Does that mean I need to have Django version >= 1.10 and then less than 1.11?

Yes. The pip manual [doc] has a section on the format of "requirement specifiers". These are documented in PEP-508 [pep] and PEP-440 [pep]:

> The comparison operator determines the kind of version clause: > > 1. ~=: Compatible release clause > 2. ==: Version matching clause > 3. !=: Version exclusion clause > 4. <=, >=: Inclusive ordered comparison clause > 5. <, >: Exclusive ordered comparison clause > 6. ===: Arbitrary equality clause. > > The comma (",") is equivalent to a logical and operator: a candidate version must match all given version clauses in order to match the specifier as a whole.

So in your case it means that the Django version is 1.10 or higher and not 1.11 or higher (so 1.10 is fine, 1.10.1, as well, but not 1.11, 1.11.1, or 2.0.1).