Merged Mainline and Madhu branches.
Binary file day1/DebugginDiagram.png has changed
--- a/day1/Session-1.vrb Thu Oct 08 16:18:15 2009 +0530
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,14 +0,0 @@
-\frametitle {Basic looping}
- \begin{lstlisting}
-# Fibonacci series:
-# the sum of two elements
-# defines the next
-a, b = 0, 1
-while b < 10:
- print b,
- a, b = b, a + b
-
-\end{lstlisting}
-\typ{1 1 2 3 5 8}\\
-\alert{Recall it is easy to write infinite loops with \kwrd{while}}
- \inctime{20}
--- a/day1/Session-2.vrb Thu Oct 08 16:18:15 2009 +0530
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,12 +0,0 @@
-\frametitle {\typ{for}: the list companion}
- \begin{lstlisting}
-In [89]: for p, ch in enumerate( a ):
- ....: print p, ch
- ....:
- ....:
-0 a
-1 b
-2 c
- \end{lstlisting}
-Try: \typ{print enumerate(a)}
-\inctime{10}
--- a/day1/Session-4.tex Thu Oct 08 16:18:15 2009 +0530
+++ b/day1/Session-4.tex Thu Oct 08 19:00:39 2009 +0530
@@ -39,6 +39,8 @@
showstringspaces=false,
keywordstyle=\color{blue}\bfseries}
+\usepackage{pgf}
+
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Macros
\setbeamercolor{emphbar}{bg=blue!20, fg=black}
@@ -339,10 +341,10 @@
\begin{frame}[fragile]
\frametitle{Debugging effectively}
\begin{itemize}
- \item \kwrd{print} based strategy
- \item Process: Hypothesis, test, refine, rinse-repeat
+ \item \kwrd{print} based strategy
+ \item Process:
\end{itemize}
-\inctime{15}
+\pgfimage[interpolate=true,width=5cm,height=5cm]{DebugginDiagram.png}
\end{frame}
\begin{frame}[fragile]
@@ -350,7 +352,27 @@
\begin{itemize}
\item Using \typ{\%debug} and \typ{\%pdb} in IPython
\end{itemize}
-\inctime{15}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Debugging in IPython}
+\small
+\begin{lstlisting}
+In [1]: import mymodule
+In [2]: mymodule.test()
+---------------------------------------------
+NameError Traceback (most recent call last)
+/media/python/iitb/workshops/day1/<ipython console> in <module>()
+/media/python/iitb/workshops/day1/mymodule.py in test()
+ 1 def test():
+----> 2 print spam
+NameError: global name 'spam' is not defined
+In [3]: %debug
+> /media/python/iitb/workshops/day1/mymodule.py(2)test()
+ 0 print spam
+ipdb>
+\end{lstlisting}
+\inctime{15}
\end{frame}
\begin{frame}[fragile]
@@ -366,7 +388,7 @@
\item Advances Functions: default arguments, keyword arguments
\item Functional Programming, list comprehensions
\item Errors and Exceptions in Python
- \item Debugging: How to use pdb, \%pdb and \%debug in IPython
+ \item Debugging: \%pdb and \%debug in IPython
\end{itemize}
\end{frame}
\end{document}
--- a/day1/Session-4.vrb Thu Oct 08 16:18:15 2009 +0530
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,2 +0,0 @@
-\frametitle {Debugging: Exercise}
-\inctime{10}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/aliquot.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,8 @@
+def aliquot(n):
+ sum = 0
+ for i in range(1, (n/2)+1):
+ if n % i == 0:
+ sum += i
+ return sum
+
+print aliquot(14)
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/amicable.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,18 @@
+import math
+
+def aliquot(n):
+ sum = 0
+ for i in range(1, int(math.sqrt(n))+1):
+ if n % i == 0:
+ sum += i + n/i
+ return sum
+
+amicable = []
+for n in range(10000, 100000):
+ m = aliquot(n)
+ if aliquot(m) == n:
+ amicable.append((m, n))
+
+print amicable
+
+# please please please profile this.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/amicable_debug.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,18 @@
+import math
+
+def aliquot(n):
+ sum = 0
+ for i in range(1, math.sqrt(n)+1):
+ if n % i == 0:
+ sum += i + n/i
+ return sum
+
+amicable = []
+for n in range(10000, 100000):
+ m = aliquot(n)
+ if aliquot(m) == n:
+ amicable.append((m, n))
+
+print amicable
+
+# please please please profile this.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/arm.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,10 @@
+cubes = []
+for i in range(10):
+ cubes.append(i ** 3)
+
+for i in range(100, 1000):
+ a = i % 10
+ b = (i / 10) % 10
+ c = (i / 100) % 10
+ if i == cubes[a] + cubes[b] + cubes[c]:
+ print "Armstrong Number: ", i
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/bishop.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,7 @@
+r, c = 5, 4
+for i in range(1, 9):
+ for j in range(1, 9):
+ a = r - i
+ b = c - j
+ if a and b and a == b or a == -b:
+ print i, j
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/collatz.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,7 @@
+a = -1
+while a > 1:
+ print a
+ if a % 2:
+ a = a * 3 + 1
+ else:
+ a /= 2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/datestring.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,23 @@
+def get_date_from_str(date_str):
+ month2mm = {
+ 'January': 1,
+ 'February': 2,
+ 'March': 3,
+ 'April': 4,
+ 'May': 5,
+ 'June': 6,
+ 'July': 7,
+ 'August': 8,
+ 'September': 9,
+ 'October': 10,
+ 'November': 11,
+ 'December': 12,
+ }
+
+ dd, month, yyyy = date_str.split()
+
+ mm = month2mm[month]
+ return int(yyyy), int(dd.strip(',')), mm
+
+date_str = raw_input('Enter a date string? ')
+print get_date_from_str(date_str)
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/duplicate_marks.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,13 @@
+students = {
+ 'Madhu': 12,
+ 'Shantanu':45,
+ 'Puneeth': 54,
+ 'Vattam': 35,
+ 'KD': 50,
+ }
+
+all_marks = students.values()
+unique_marks = set(all_marks)
+
+print "Number of Duplicate marks: ", len(all_marks) - len(unique_marks)
+print "Duplicate marks: ", set(all_marks - list(unique_marks))
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/even_perfect_4.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,17 @@
+def is_perfect_square(n):
+ i = 1
+ while i * i < n:
+ i += 1
+ return i * i == n
+
+def all_digits_even(n):
+ if n < 0: n = -n
+ while n > 0:
+ if n % 2 == 1:
+ return False
+ n /= 10
+ return True
+
+for i in range(2222, 8888):
+ if all_digits_even(i) and is_perfect_square(i):
+ print i
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/find_pow_2.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,29 @@
+def is_pow_2(n):
+ bin_count = 0
+ while n > 0:
+ if n % 2 == 1:
+ bin_count += 1
+ if bin_count > 1:
+ return False
+ n /= 2
+
+ return bin_count == 1
+
+def collatz_pow_2(n):
+ if n == 1: return 4
+ if n == 2: return 4
+ collatz_pow_2 = []
+ while n > 2:
+ print n,
+ if is_pow_2(n):
+ collatz_pow_2.append(n)
+
+ if n % 2:
+ n = n * 3 - 1
+ else:
+ n /= 2
+
+ return max(collatz_pow_2)
+
+import sys
+collatz_pow_2(int(sys.argv[1]))
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/funcs2.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,28 @@
+import math
+
+def linspace(a, b, N):
+ lns = []
+ step = (float(b) - float(a)) / float(N - 1)
+ print step
+ for i in range(N):
+ lns.append(a + i*step)
+
+ return lns
+
+def sin_func():
+ x = linspace(0, 5, 11)
+ sin_list = []
+ for i in x:
+ sin_list.append(math.sin(i))
+
+ print sin_list
+
+def sinsin_func():
+ x = linspace(0, 5, 11)
+ sin_list = []
+ for i in x:
+ sin_list.append(math.sin(i) + math.sin(10*i))
+
+ print sin_list
+
+sinsin_func()
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/gcd.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,8 @@
+def gcd(a, b):
+ if a % b == 0:
+ return b
+ return gcd(b, a%b)
+
+print gcd(5, 40)
+print gcd(11, 60)
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/gcd_another.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,13 @@
+def gcd(a, b):
+ if a - b == 0:
+ return b
+ if a > b:
+ return gcd(b, a-b)
+ else:
+ return gcd(b, b-a)
+
+def lcm(a, b):
+ return (a * b) / gcd(a, b)
+
+print lcm(21, 14)
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/kwfreq.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,14 @@
+import keyword
+f = open('/home/madhu/pyprogs/pytriads.py')
+
+freq = {}
+for line in f:
+ words = line.split()
+ for word in words:
+ key = word.strip(',.!;?()[]: ')
+ if keyword.iskeyword(key):
+ value = freq.get(key, 1)
+ freq[key] = value + 1
+
+print freq
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/linspace.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,10 @@
+def linspace(a, b, N):
+ lns = []
+ step = (float(b) - float(a)) / float(N - 1)
+ print step
+ for i in range(N):
+ lns.append(a + i*step)
+
+ return lns
+
+print linspace(0, 5, 11)
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/markstats.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,22 @@
+import math
+
+f = open('/home/madhu/Desktop/marks.dat')
+
+subj_marks = [[]] * 5
+names = []
+for line in f:
+ fields = line.split(';')
+ names.append(fields[2])
+ for i in range(5):
+ subj_marks[i].append(int(fields[i+3]))
+
+for i in range(5):
+ avg_marks = float(sum(subj_marks[i])) / len(subj_marks[i])
+ student = names[subj_marks[i].index(max(subj_marks[i]))]
+ sigma = 0
+ for j in subj_marks[i]:
+ sigma += (j - avg_marks) ** 2
+
+ std_dev = math.sqrt(sigma)
+ print "Average marks for subject: %f is Standard Deviation is %f, Student with Highest Marks is %s" % (avg_marks, std_dev, student)
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/missing_num.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,16 @@
+str_range = '4-7, 9, 12, 15'
+
+ranges = str_range.split(',')
+
+lst = []
+for r in ranges:
+ vals = r.split('-')
+ if len(vals) == 2:
+ lst.extend(range(int(vals[0]), int(vals[1]) + 1))
+ else:
+ lst.append(int(vals[0]))
+
+set_range = set(lst)
+all_elems = set(range(min(lst), max(lst)))
+
+print all_elems - set_range
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/pyramid1.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,5 @@
+n = input('How many lines? ')
+for i in range(1, n + 1):
+ for j in range(i):
+ print i,
+ print
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/pytriads.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,18 @@
+def is_perfect_square(n):
+ i = 1
+ while i * i < n:
+ i += 1
+ return i * i == n, i
+
+def gcd(a, b):
+ if a % b == 0:
+ return b
+ else:
+ return gcd(b, a%b)
+
+for a in range(3, 100):
+ for b in range(a+1, 100):
+ ips, c = is_perfect_square((a * a) + (b * b))
+ if ips and gcd(a, b) == 1:
+ print a, b, c
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/readmarks.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,5 @@
+f = open('/home/madhu/Desktop/marks.dat')
+
+for line in f:
+ fields = line.split(';')
+ print "Name: %s, Total Marks: %s" % (fields[2].strip(), fields[8].strip())
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/roots.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,28 @@
+import math
+
+def linspace(a, b, N):
+ lns = []
+ step = (float(b) - float(a)) / float(N - 1)
+ print step
+ for i in range(N):
+ lns.append(a + i*step)
+
+ return lns
+
+def sinsin_func():
+ x = linspace(0, 5, 11)
+ sin_list = []
+ for i in x:
+ sin_list.append(math.sin(i) + math.sin(10*i))
+
+ return sin_list
+
+def find_root_range():
+ sin_list = sinsin_func()
+ for i, sins in enumerate(sin_list):
+ if (sin_list[i] > 0 and sin_list[i+1] < 0) or (sin_list[i] > 0 and sin_list[i+1] < 0):
+ print "Roots lie between: %f and %f" % (sin_list[i], sin_list[i+1])
+ if sin_list[i] == 0:
+ print "%f is the root" % sin_list[i]
+
+find_root_range()
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/round_float.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,12 @@
+# round using int
+n = 17.3 # any float
+int (n + .5)
+
+# round it off to first decimal place
+round(amount * 10) / 10.0
+
+# round it off to nearest 5 paise
+round(amount * 20) / 20.0
+
+# exchange two variables
+a, b = b, a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/strrange.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,13 @@
+str_ranges = "1, 3-7, 12, 15, 18-21"
+
+ranges = str_ranges.split(',')
+
+lst = []
+for r in ranges:
+ vals = r.split('-')
+ if len(vals) == 2:
+ lst.extend(range(int(vals[0]), int(vals[1]) + 1))
+ else:
+ lst.append(int(vals[0]))
+
+print lst
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/day1/exercise/word_frequencies.py Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,11 @@
+f = open('/home/madhu/pyprogs/pytriads.py')
+
+freq = {}
+for line in f:
+ words = line.split()
+ for word in words:
+ key = word.strip(',.!;?\'" ')
+ value = freq.get(key, 1)
+ freq[key] = value + 1
+
+print freq
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/quiz.tex Thu Oct 08 19:00:39 2009 +0530
@@ -0,0 +1,11 @@
+\documentclass[a4paper,10pt]{book}
+
+
+\begin{document}
+Which version of Python were you using?
+List some key differences between IPython and Vanilla Python
+What is the biggest integer number that can be represented by Python?
+What is the result of 17.0 / 2?
+What does '*' * 40 produce?
+
+\end{document}