import arcpy, os
arcpy.env.overwriteOutput = True
mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd)[0]
layerName = arcpy.GetParameterAsText(0)
fieldName = arcpy.GetParameterAsText(1)
imgLocation = arcpy.GetParameterAsText(2)
whereList = []
layerFile = arcpy.mapping.Layer(layerName)
layerFile.definitionQuery = ""
print df.name
with arcpy.da.SearchCursor(layerName, fieldName) as cursor:
    for row in cursor:
        for item in row:
            whereList.append(item)
for wl in whereList:
    arcpy.RefreshActiveView()
    mxd.save()   
    layerFile.definitionQuery = fieldName + "= '" + wl + "'"
    new_extent = layerFile.getExtent()
    df.extent = new_extent
    df.scale *= 1.5
    
    for elm in arcpy.mapping.ListLayoutElements(mxd, "TEXT_ELEMENT", "title"):      
    
        if elm.name == "title":
           elm.text = wl
    arcpy.RefreshActiveView()
    outFile = os.path.join(imgLocation, wl + ".pdf")
    arcpy.AddMessage(outFile)
    outFile = imgLocation + "\\" + wl + ".pdf"   
    arcpy.mapping.ExportToPDF(mxd, outFile, "PAGE_LAYOUT")
del mxd
What line was your first error encountered on?
ArcGIS Pro Python reference—ArcGIS Pro | Documentation
as a start...
hints
mapping ---> mp
print "blah" ---> print("blah")
work your way through the code so you can learn the translation as you go
i don't know what is the erorr exactly  line 31
for lyt in aprx.listLayouts("Layout"): SyntaxError: invalid syntax
import arcpy, os
arcpy.env.overwriteOutput = True
aprx = arcpy.mp.ArcGISProject("CURRENT")
df = aprx.listMaps()[0]
layerName = arcpy.GetParameterAsText(0)
fieldName = arcpy.GetParameterAsText(1)
imgLocation = arcpy.GetParameterAsText(2)
whereList = []
layerFile = df.listLayers(layerName)[0]
layerFile.definitionQuery = ""
print ((df.name))
with arcpy.da.SearchCursor(layerName, fieldName) as cursor:
    for row in cursor:
        for item in row:
            whereList.append(item)
for wl in whereList:      
    layerFile.definitionQuery = fieldName + "= '" + wl + "'"
    #new_extent = layerFile.getExtent()
    lay = aprx.listLayouts("Layout")
    mf = lay.listElements("Layers Map Frame","New Data Frame Map Frame")
    new_extent = mf.camera.setExtent(mf.getLayerExtent(layerFile, False, True)
    #df.extent = new_extent
    #df.scale *= 1.5
    for lyt in aprx.listLayouts("Layout"):
        for elm in lyt.listElements("TEXT_ELEMENT"):
            if elm.name == "Text":
                elm.text = wl          syntax error in line 31:
import arcpy, os
arcpy.env.overwriteOutput = True
aprx = arcpy.mp.ArcGISProject("CURRENT")
df = aprx.listMaps()[0]
layerName = arcpy.GetParameterAsText(0)
fieldName = arcpy.GetParameterAsText(1)
imgLocation = arcpy.GetParameterAsText(2)
whereList = []
layerFile = df.listLayers(layerName)[0]
layerFile.definitionQuery = ""
print ((df.name))
with arcpy.da.SearchCursor(layerName, fieldName) as cursor:
    for row in cursor:
        for item in row:
            whereList.append(item)
for wl in whereList:      
    layerFile.definitionQuery = fieldName + "= '" + wl + "'"
    #new_extent = layerFile.getExtent()
    lay = aprx.listLayouts("Layout")
    mf = lay.listElements("Layers Map Frame","New Data Frame Map Frame")
    new_extent = mf.camera.setExtent(mf.getLayerExtent(layerFile, False, True)
    #df.extent = new_extent
    #df.scale *= 1.5
    for lyt in aprx.listLayouts("Layout"):
        for elm in lyt.listElements("TEXT_ELEMENT"):
            if elm.name == "Text":
                elm.text = wl          
missing a closing bracket in
new_extent = mf.camera.setExtent(mf.getLayerExtent(layerFile, False, True)
should be
new_extent = mf.camera.setExtent(mf.getLayerExtent(layerFile, False, True))
after i put the bracket it showed me this message error
AttributeError: 'list' object has no attribute 'listElements'
import arcpy, os
arcpy.env.overwriteOutput = True
aprx = arcpy.mp.ArcGISProject("CURRENT")
df = aprx.listMaps()[0]
layerName = arcpy.GetParameterAsText(0)
fieldName = arcpy.GetParameterAsText(1)
imgLocation = arcpy.GetParameterAsText(2)
whereList = []
layerFile = df.listLayers(layerName)[0]
layerFile.definitionQuery = ""
print ((df.name))
with arcpy.da.SearchCursor(layerName, fieldName) as cursor:
    for row in cursor:
        for item in row:
            whereList.append(item)
for wl in whereList:      
    layerFile.definitionQuery = fieldName + "= '" + wl + "'"
    #new_extent = layerFile.getExtent()
    lay = aprx.listLayouts("Layout 1")
    mf = lay.listElements("Layers Map Frame","New Data Frame Map Frame")
    new_extent = mf.camera.setExtent(mf.getLayerExtent(layerFile, False, True))
    #df.extent = new_extent
    #df.scale *= 1.5
    for lyt in aprx.listLayouts("Layout 1"):
        for elm in lyt.listElements("TEXT_ELEMENT"):
            if elm.name == "Text":
                elm.text = wl          
     
    name = ''
    for char in wl:
        if char.isalpha():
            name+=char
    outFile = imgLocation + "\\" + name  + ".pdf"   
    arcpy.mp.ExportToPDF(aprx, outFile, "PAGE_LAYOUT")
del aprx
the two data frame called as you see in the screen shot blow :
TextElement—ArcGIS Pro | Documentation has some code examples, you may need to examine the required workflow
It looks to me list you need to add another loop - to process the list of layouts that your get from the call to listLayouts. Like this
for lyts in aprx.listLayouts("Layout 1"):
    for lyt in lyts:
        for elm in lyt.listElements("TEXT_ELEMENT"):
            if elm.name == "Text":
                elm.text = wl
