Wrong method in Skylark pyx_library function

[gurobokum]

ERROR: /home/jiojiajiu/workspace/jive/resonata/resonata/clara/indexing/BUILD:3:1: Traceback (most recent call last):
        File "/home/jiojiajiu/workspace/jive/resonata/resonata/clara/indexing/BUILD", line 3
                pyx_library(name = "search", srcs = ["search.p..."])
        File "/home/jiojiajiu/.cache/bazel/_bazel_jiojiajiu/f955f0ee4d02afcbda0567e4285e95fc/external/cython/Tools/rules.bzl", line 33, in pyx_library
                src.endwith(".py")
type 'string' has no method endwith(string).