After building and precompiling PyCall, I tried out some of the example code to just verify its functionality. Unfortunately I'm met with errors straight away.
julia> import Pkg
julia> Pkg.build("PyCall")
Building Conda ─→ `C:\Users\Student\.julia\packages\Conda\kLXeC\deps\build.log`
Building PyCall → `C:\Users\Student\.julia\packages\PyCall\ttONZ\deps\build.log`
julia> import PyCall
julia> math = pyimport("math")
ERROR: UndefVarError: pyimport not defined
Stacktrace:
[1] top-level scope at none:0
julia> py"""
import math
math.sin(math.pi / 4)
"""
ERROR: LoadError: UndefVarError: @py_str not defined
in expression starting at REPL[5]:1
julia> py"import math"
ERROR: LoadError: UndefVarError: @py_str not defined
in expression starting at REPL[6]:1
I'm using Julia 1.1.1 (2019-05-16) on Windows 10 x64. I'm not seeing anything online regards to this specific issue and am a touch on the frustrated side with it now.
As you are importing PyCall, you must specify the scope of the pyimport() function by prefixing it with the module name itself, i.e.
julia> import PyCall
julia> math = PyCall.pyimport("math")
PyObject <module 'math' from '/usr/lib/python3.7/lib-dynload/math.cpython-37m-x86_64-linux-gnu.so'>
julia> math.sin(math.pi/4)
0.7071067811865475
Alternatively, as Gomiero mentioned in discussion, your problem can also be resolved by bringing the functions into local scope by utilising using PyCall instead;
julia> using PyCall
julia> math = pyimport("math")
PyObject <module 'math' from '/usr/lib/python3.7/lib-dynload/math.cpython-37m-x86_64-linux-gnu.so'>
julia> math.sin(math.pi/4)
0.7071067811865475
There is more on this in the Julia documentation.