

In [1]:

    
from __future__ import print_function



In [2]:

    
filename = '20150410-dojo-prices.txt'

Show what is in the file.



In [3]:

    
print(open(filename).read())









    



IBM 3
AAPL 3.1415926
GOGL 10

Show how split method splits each line into a list.



In [4]:

    
for line in open(filename):
    print(line.split())









    



['IBM', '3']
['AAPL', '3.1415926']
['GOGL', '10']

Straightforward loop



In [5]:

    
max_price = 0.0
for line in open(filename):
    price = float(line.split()[1])
    max_price = max(max_price, price)
print(max_price)

Using a generator expression



In [6]:

    
max((float(line.split()[1]) for line in open(filename)))









    Out[6]:





10.0

Functional approach



In [7]:

    
max(map(lambda line: float(line.split()[1]), open(filename)))









    Out[7]:





10.0



In [8]:

    
max(map(float, map(lambda line: line.split()[1], open(filename))))









    Out[8]:





10.0



In [9]:

    
max(map(float, map(lambda x: x[1] ,map(lambda line: line.split(), open(filename)))))









    Out[9]:





10.0

min, max, sum, any, and all are some built-in reduce style functions.