problem with UnboundLocalError: local variable referenced before assignment
0
So I'm testing my knowledge on webscraping by writing this little script (I know some things are redundant, it's just me playing around with things):
def programstart():
import re
from selenium import webdriver
from bs4 import BeautifulSoup
ff=webdriver.Firefox()
ff.get('https://www.ozbargain.com.au/deals')
linkpattern = r'https://www.ozbargain.com.au/node/.*'
donotpassthislink = 'https://www.ozbargain.com.au/node/415763'
#list of found lnks
titlelist =
#loop to find links
while True:
soup = BeautifulSoup(ff.page_source)
raw_links = soup.find_all(name='a', href=re.compile(linkpattern))
for links in raw_links:
titles = ff.find_element_by_xpath("//h2[@class='title']").text
extract = links
if donotpassthislink == extract:
break
else:
pass
titlelist.append(titles)
# Load next page
if donotpassthislink == extract: # stop loop at first movie link from last time.
break
else:
ff.get(ff.find_element_by_xpath("//a[@class='pager-next active']").get_attribute('href'))
programstart()
I get this error:
Traceback (most recent call last):
File "F:/Dropbox/Funfile/ben.py", line 35, in <module>
programstart()
File "F:/Dropbox/Funfile/ben.py", line 29, in programstart
if donotpassthislink == extract: # stop loop at first movie link from last time.
UnboundLocalError: local variable 'extract' referenced before assignment
I find this weird since this loop was used in another script that works perfectly.
So I write a simplified script:
test = 'lets break this sentence up'
list =
def func():
while True:
for i in test:
extract = i
print(extract)
if extract == 'u':
break
else:
pass
list.append(extract)
if extract == 'u':
print('done')
break
func()
And it executes without any issues.
What's going on?
python-3.x
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
add a comment |
0
So I'm testing my knowledge on webscraping by writing this little script (I know some things are redundant, it's just me playing around with things):
def programstart():
import re
from selenium import webdriver
from bs4 import BeautifulSoup
ff=webdriver.Firefox()
ff.get('https://www.ozbargain.com.au/deals')
linkpattern = r'https://www.ozbargain.com.au/node/.*'
donotpassthislink = 'https://www.ozbargain.com.au/node/415763'
#list of found lnks
titlelist =
#loop to find links
while True:
soup = BeautifulSoup(ff.page_source)
raw_links = soup.find_all(name='a', href=re.compile(linkpattern))
for links in raw_links:
titles = ff.find_element_by_xpath("//h2[@class='title']").text
extract = links
if donotpassthislink == extract:
break
else:
pass
titlelist.append(titles)
# Load next page
if donotpassthislink == extract: # stop loop at first movie link from last time.
break
else:
ff.get(ff.find_element_by_xpath("//a[@class='pager-next active']").get_attribute('href'))
programstart()
I get this error:
Traceback (most recent call last):
File "F:/Dropbox/Funfile/ben.py", line 35, in <module>
programstart()
File "F:/Dropbox/Funfile/ben.py", line 29, in programstart
if donotpassthislink == extract: # stop loop at first movie link from last time.
UnboundLocalError: local variable 'extract' referenced before assignment
I find this weird since this loop was used in another script that works perfectly.
So I write a simplified script:
test = 'lets break this sentence up'
list =
def func():
while True:
for i in test:
extract = i
print(extract)
if extract == 'u':
break
else:
pass
list.append(extract)
if extract == 'u':
print('done')
break
func()
And it executes without any issues.
What's going on?
python-3.x
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
1
Ifraw_linksis an empty list, theforloop is never executed and the variableextractis never defined. As a side note, do not import modules in a function andelse: passis useless.
– DYZ
Nov 16 '18 at 4:53
Thank you! I put a print(raw_links) after its definition and it came up empty.
– Paul Zet
Nov 16 '18 at 5:18
add a comment |
0
0
0
So I'm testing my knowledge on webscraping by writing this little script (I know some things are redundant, it's just me playing around with things):
def programstart():
import re
from selenium import webdriver
from bs4 import BeautifulSoup
ff=webdriver.Firefox()
ff.get('https://www.ozbargain.com.au/deals')
linkpattern = r'https://www.ozbargain.com.au/node/.*'
donotpassthislink = 'https://www.ozbargain.com.au/node/415763'
#list of found lnks
titlelist =
#loop to find links
while True:
soup = BeautifulSoup(ff.page_source)
raw_links = soup.find_all(name='a', href=re.compile(linkpattern))
for links in raw_links:
titles = ff.find_element_by_xpath("//h2[@class='title']").text
extract = links
if donotpassthislink == extract:
break
else:
pass
titlelist.append(titles)
# Load next page
if donotpassthislink == extract: # stop loop at first movie link from last time.
break
else:
ff.get(ff.find_element_by_xpath("//a[@class='pager-next active']").get_attribute('href'))
programstart()
I get this error:
Traceback (most recent call last):
File "F:/Dropbox/Funfile/ben.py", line 35, in <module>
programstart()
File "F:/Dropbox/Funfile/ben.py", line 29, in programstart
if donotpassthislink == extract: # stop loop at first movie link from last time.
UnboundLocalError: local variable 'extract' referenced before assignment
I find this weird since this loop was used in another script that works perfectly.
So I write a simplified script:
test = 'lets break this sentence up'
list =
def func():
while True:
for i in test:
extract = i
print(extract)
if extract == 'u':
break
else:
pass
list.append(extract)
if extract == 'u':
print('done')
break
func()
And it executes without any issues.
What's going on?
python-3.x
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
So I'm testing my knowledge on webscraping by writing this little script (I know some things are redundant, it's just me playing around with things):
def programstart():
import re
from selenium import webdriver
from bs4 import BeautifulSoup
ff=webdriver.Firefox()
ff.get('https://www.ozbargain.com.au/deals')
linkpattern = r'https://www.ozbargain.com.au/node/.*'
donotpassthislink = 'https://www.ozbargain.com.au/node/415763'
#list of found lnks
titlelist =
#loop to find links
while True:
soup = BeautifulSoup(ff.page_source)
raw_links = soup.find_all(name='a', href=re.compile(linkpattern))
for links in raw_links:
titles = ff.find_element_by_xpath("//h2[@class='title']").text
extract = links
if donotpassthislink == extract:
break
else:
pass
titlelist.append(titles)
# Load next page
if donotpassthislink == extract: # stop loop at first movie link from last time.
break
else:
ff.get(ff.find_element_by_xpath("//a[@class='pager-next active']").get_attribute('href'))
programstart()
I get this error:
Traceback (most recent call last):
File "F:/Dropbox/Funfile/ben.py", line 35, in <module>
programstart()
File "F:/Dropbox/Funfile/ben.py", line 29, in programstart
if donotpassthislink == extract: # stop loop at first movie link from last time.
UnboundLocalError: local variable 'extract' referenced before assignment
I find this weird since this loop was used in another script that works perfectly.
So I write a simplified script:
test = 'lets break this sentence up'
list =
def func():
while True:
for i in test:
extract = i
print(extract)
if extract == 'u':
break
else:
pass
list.append(extract)
if extract == 'u':
print('done')
break
func()
And it executes without any issues.
What's going on?
python-3.x
python-3.x
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
asked Nov 16 '18 at 4:45
Paul ZetPaul Zet
307
307
1
Ifraw_linksis an empty list, theforloop is never executed and the variableextractis never defined. As a side note, do not import modules in a function andelse: passis useless.
– DYZ
Nov 16 '18 at 4:53
Thank you! I put a print(raw_links) after its definition and it came up empty.
– Paul Zet
Nov 16 '18 at 5:18
add a comment |
1
Ifraw_linksis an empty list, theforloop is never executed and the variableextractis never defined. As a side note, do not import modules in a function andelse: passis useless.
– DYZ
Nov 16 '18 at 4:53
Thank you! I put a print(raw_links) after its definition and it came up empty.
– Paul Zet
Nov 16 '18 at 5:18
1
1
If
raw_links is an empty list, the for loop is never executed and the variable extract is never defined. As a side note, do not import modules in a function and else: pass is useless.– DYZ
Nov 16 '18 at 4:53
If
raw_links is an empty list, the for loop is never executed and the variable extract is never defined. As a side note, do not import modules in a function and else: pass is useless.– DYZ
Nov 16 '18 at 4:53
Thank you! I put a print(raw_links) after its definition and it came up empty.
– Paul Zet
Nov 16 '18 at 5:18
Thank you! I put a print(raw_links) after its definition and it came up empty.
– Paul Zet
Nov 16 '18 at 5:18
add a comment |
0
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1
If
raw_linksis an empty list, theforloop is never executed and the variableextractis never defined. As a side note, do not import modules in a function andelse: passis useless.– DYZ
Nov 16 '18 at 4:53
Thank you! I put a print(raw_links) after its definition and it came up empty.
– Paul Zet
Nov 16 '18 at 5:18