feat(python): pyenv manager

lib/manager/pyenv/__snapshots__/extract.spec.ts.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`manager/pyenv/extract extractPackageFile() returns a result 1`] = `
+Array [
+  Object {
+    "currentValue": "3.7.1",
+    "datasource": "docker",
+    "depName": "python",
+    "lookupName": "python",
+  },
+]
+`;
+
+exports[`manager/pyenv/extract extractPackageFile() skips non ranges 1`] = `
+Array [
+  Object {
+    "currentValue": "latestn",
+    "datasource": "docker",
+    "depName": "python",
+    "lookupName": "python",
+  },
+]
+`;
+
+exports[`manager/pyenv/extract extractPackageFile() supports ranges 1`] = `
+Array [
+  Object {
+    "currentValue": "3.8",
+    "datasource": "docker",
+    "depName": "python",
+    "lookupName": "python",
+  },
+]
+`;

lib/manager/pyenv/extract.spec.ts

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+import { getName } from '../../../test/util';
+import { extractPackageFile } from './extract';
+
+describe(getName(), () => {
+  describe('extractPackageFile()', () => {
+    it('returns a result', () => {
+      const res = extractPackageFile('3.7.1\n');
+      expect(res.deps).toMatchSnapshot();
+    });
+    it('supports ranges', () => {
+      const res = extractPackageFile('3.8\n');
+      expect(res.deps).toMatchSnapshot();
+    });
+    it('skips non ranges', () => {
+      const res = extractPackageFile('latestn');
+      expect(res.deps).toMatchSnapshot();
+    });
+  });
+});

lib/manager/pyenv/extract.ts

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+import * as datasourceDocker from '../../datasource/docker';
+import type { PackageDependency, PackageFile } from '../types';
+
+export function extractPackageFile(content: string): PackageFile {
+  const dep: PackageDependency = {
+    depName: 'python',
+    currentValue: content.trim(),
+    datasource: datasourceDocker.id,
+    lookupName: 'python',
+  };
+  return { deps: [dep] };
+}

lib/manager/pyenv/index.ts

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+import { LANGUAGE_PYTHON } from '../../constants/languages';
+import * as dockerVersioning from '../../versioning/docker';
+
+export { extractPackageFile } from './extract';
+
+export const language = LANGUAGE_PYTHON;
+
+export const defaultConfig = {
+  fileMatch: ['(^|/).python-version$'],
+  versioning: dockerVersioning.id,
+};

lib/manager/pyenv/readme.md

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+Simply keeps the `.python-version` file updated.