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:
~=: Compatible release clause==: Version matching clause!=: Version exclusion clause<=,>=: Inclusive ordered comparison clause<,>: Exclusive ordered comparison clause===: 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).