eval=FALSE does not seem to work for the python engine

In my Rmd document, I'm including some python code, but since it takes forever to run, Id like to not evaluate it. I set the eval=FALSE tag, but when I knit the document, it still attempts to run it. any ideas?

[3 backticks]{python eval=FALSE, engine.path='/usr/local/bin/python3'}

from pyquery import PyQuery as pq
import requests
import smtplib
import os
import sys
import os.path
import re
import pandas as pd
import feather

FILENAME_LASTSTATUS = os.path.join(sys.path[0], "LAST_STATUS_{0}.txt")
mynum = 1890048782 # THis is my case number

def poll_optstatus(casenumber):
    poll USCIS case status given receipt number (casenumber)
        param1: casenumber the case receipt number
        a tuple (status, details) containing status and detailed info
    headers = {
        'Accept': 'text/html, application/xhtml+xml, image/jxr, */*',
        'Accept-Encoding': 'gzip, deflate',
        'en-US, en; q=0.8, zh-Hans-CN; q=0.5, zh-Hans; q=0.3',
        'Cache-Control': 'no-cache',
        'Connection': 'Keep-Alive',
        'Content-Type': 'application/x-www-form-urlencoded',
        'Host': 'egov.uscis.gov',
        'Referer': 'https://egov.uscis.gov/casestatus/mycasestatus.do',
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586'
    url = "https://egov.uscis.gov/casestatus/mycasestatus.do"
    data = {"appReceiptNum": casenumber, 'caseStatusSearchBtn': 'CHECK+STATUS'}

    res = requests.post(url, data=data, headers=headers)
    doc = pq(res.text)
    status = doc('h1').text()
    code = STATUS_OK if status else STATUS_ERROR
    details = doc('.text-center p').text()
    return (code, status, details)

# Get every 10th case status
case_nums = ['YSC' + str(i) for i in range(1890038932, 1890079632)]
vals = [poll_optstatus(case) for case in case_nums]

df = pd.DataFrame.from_records(vals)
df['case'] = case_nums

feather.write_dataframe(df, "uscis.feather")
[3 backticks]

I think the issue is that I had both eval = FALSE and i added an engine.path. when I remove the engine path, it seems to work fine.