Combining commands with && sometimes produces syntax error

[sirloon]

With mychem:

upload("ndc") && diff(("src","ndc_ok"),("src","ndc"),mode="purge")

gives syntax error, logs show it:

INFO:hub:Run: '_and(partial(upload,"ndc"),partial(diff(("src","ndc_ok"),,"src","ndc"),mode="purge"))' 
  File "<ipython-input-2-f4011523f7f9>", line 1
    _and(partial(upload,"ndc"),partial(diff(("src","ndc_ok"),,"src","ndc"),mode="purge"))
                                                             ^
SyntaxError: invalid syntax