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LING 408/508: Programming for
Linguists
Lecture 20
November 16th
Administrivia
• Quickie Homework 10
– Python
• Term Programming Project
– Did you email me about your proposed project
yet?
Online documentation
Python
• Chapter 3: Computing with Numbers
• Last time:
– Number data types: int, float
– Matters for things like division: /
• 9/5 produces different result from 9/5.0
Basic:
Library: module
Python
• math.sqrt()
complex numbers:
import cmath
Python
• range(): produces a list (sequence)
– range(n)
[0,1,..,n-1]
– range(start,n)
[start,start+1,..,n-1]
– range(start,n,step)
[start,start+step,…,last]
–
last=start+k*step < n
– range(n,stop,-step)
counts down
(page 40)
Python
How about to
2 decimal places?
Python
• page 60: see factorial.py
– Python automatically converts to type long int from
int (32 bit 2's complement), (page 64–65, section 3.5)
– explicit type coercion:
1.
2.
3.
4.
5.
float()
int()
long()
complex(r,i)
complex(string)
Homework 10
• Pick any three of the programming exercises
from page 72-75
– Program them up in python
– Submit your code and sample runs all in one pdf
file
– Due this Saturday by midnight