Basic project to reproduce import issues.

BUILD

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+load("@third_party_py//:requirements.bzl", "requirement")
+
+py_binary(
+    name = "repro",
+    srcs = [
+        "repro.py",
+    ],
+    deps = [
+        requirement("google-cloud-bigquery"),
+        requirement("google-cloud-storage"),
+    ],
+)

WORKSPACE

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+# Helpful macros to support requirements/pip integration.
+git_repository(
+    name = "io_bazel_rules_python",
+    commit = "40d44a7258a9016925969e2ff41c93881ddd7155",
+    remote = "https://github.com/bazelbuild/rules_python.git",
+)
+
+load("@io_bazel_rules_python//python:pip.bzl", "pip_repositories", "pip_import")
+
+pip_repositories()
+
+pip_import(
+    name = "third_party_py",
+    requirements = "//:requirements.txt",
+)
+
+load("@third_party_py//:requirements.bzl", "pip_install")
+
+pip_install()

repro.py

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+import sys
+
+print(sys.path)
+import google
+print(google)
+from google.cloud import bigquery
+from google.cloud import storage
+
+def main():
+  print("You'll never see me :(")
+
+if __name__ == '__main__':
+  main()

requirements.txt

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+google-cloud-bigquery==0.27.0
+google-cloud-storage==1.1.1