Lists of stock symbols can be found at either of these links:
You can download a list of symbols from the nasdaq.com site for the Nasdaq, NYSE, and AMEX exchanges.
The FTP directory at ftp.nasdaqtrader.com gets updated every night at 3:00AM (symbols can change). Here is a quick Python script to download the nasdaqlisted.txt and otherlisted.txt files from the ftp site:
#!/usr/bin/python
# typical use: python get_symbols.py > symbols.txt
import urllib
def get_data( url ):
data = urllib.urlopen( url )
lines = []
for line in data:
lines.append( line.rstrip().split('|') )
return lines
url = 'ftp://ftp.nasdaqtrader.com/SymbolDirectory/'
files = ['nasdaqlisted.txt', 'otherlisted.txt']
for f in files:
print get_data( url + f )
List Comprehensions in Python
# create a new list>>> a = [1,2,3,4,5]>>> a
[1, 2, 3, 4, 5]
# sample list comprehension expression; equivalent to b = a>>> b = [a[i] for i in range(len(a))]>>> b
[1, 2, 3, 4, 5]
# only even indices>>> b = [a[i] for i in range(len(a)) if i % 2 == 0]>>> b [1, 3, 5]
# only even indices and conditionally modifies the value of a[i]
>>> b = [a[i]*2 if i > 1 else a[i] for i in range(len(a)) if i % 2 == 0]
>>> b [1, 6, 10]
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