import arcpy
import os

arcpy.env.workspace = r"E:arcGIS_SharedPythonExportCumulative_CA2"
path =  r"E:arcGIS_SharedPythonExportCumulative_CA2"

### Create PDF Map Book File
CApdfPath = os.path.join(path, 'SanBruno_CumulativeHeatMaps.pdf')

CApdfDoc = arcpy.mp.PDFDocumentCreate(CApdfPath)

### List all files in the output folder
CApdfList = arcpy.ListFiles( "CACumulativeSumWithin3000_SanBruno_*")

### Add market title page to the newly created PDF document
CApdfDoc.appendPages(os.path.join(path, "CATitlePage.pdf"))


### Append market specific pages to the PDF
for CApdf in CApdfList:

    print(CApdf)

    CApdfDoc.appendPages(r"E:arcGIS_SharedPythonExportCumulative_CA2%s"%CApdf)
    print(CApdf)


CApdfDoc.saveAndClose()