ch 7:small also added

Author: theharshbhatia

3_5.py

@@ -1,3 +1,9 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+Chapter 3
+'''
 def straight():
     print ('-------',end="")
 

6_1.py

@@ -0,0 +1,18 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''Exercise 6.1
+Write a compare function that returns 1 if x > y, 0 if x == y, and -1 if x < y.'''
+def compare(x,y):
+  if x>y:
+    return 1
+  elif x==y:
+    return 0
+  else:
+    return -1
+
+print compare(2,1)
+print compare(1,1)
+print compare(1,3)

6_2.py

@@ -0,0 +1,17 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''Exercise 6.2
+Use incremental development to write a function called hypotenuse that returns
+the length of the hypotenuse of a right triangle given the lengths of the two legs as
+arguments. Record each stage of the development process as you go'''
+import math
+def hypotenuse(x,y):
+  x=x*x
+  # print x
+  y=y*y
+  print math.sqrt(x+y)
+
+hypotenuse(3,4)

6_3.py

@@ -0,0 +1,19 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''
+Exercise: 6.3
+'''
+
+def is_between(x,y,z):
+  if x<=y:
+    if y<=z:
+      return "True"
+    else:
+      return "False"
+  else:
+    return "False"
+
+print is_between(3,4,2)

6_6.py

@@ -0,0 +1,33 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''
+Exercise: 6.6: incomplete
+'''
+def first(word):
+  return word[0]
+
+def last(word):
+  return word[-1]
+
+def middle(word):
+  return word[1:-1]
+
+print middle("aa")
+print middle("b")
+print middle('')
+
+def is_palindrome(word):
+  wordl=int(len(word))
+  if (wordl%2==0):
+    print "even"
+  else:
+    for i in wordl:
+      if word[i]==word[-i]:
+        return 0
+      else:
+        return 1
+
+print is_palindrome("lol")

7_1.py

@@ -0,0 +1,14 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''
+Exercise 7.1: Rewrite the function print_n from Section 5.8 using iteration instead of recursion.
+'''
+def print_n(s, n):
+  while n != 0:
+    print s
+    n=n-1
+  
+print_n(2,7)

7_2.py

@@ -0,0 +1,21 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''
+Exercise 7.2:Encapsulate loop in a function called square_root that takes a as a parameter,
+chooses a reasonable value of x, and returns an estimate of the square root of a.
+'''
+import math
+def square_root(a):
+  x = 10
+  while True:
+    # print x
+    y = (x + a/x) / 2
+    if abs(y- x )< 0.000001:
+      break
+    x = y
+  return x
+
+print square_root(4)

7_3.py

@@ -0,0 +1,30 @@
+'''
+Complete soltion of Book
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''
+INCOMPLETE
+Exercise 7.2:Encapsulate loop in a function called square_root that takes a as a parameter,
+chooses a reasonable value of x, and returns an estimate of the square root of a.
+'''
+import math
+def square_root(a):
+  x = 3
+  while True:
+    # print x
+    y = (x + a/x) / 2
+    if abs(y- x )< 0.001:
+      break
+    x = y
+  return x
+
+def test_square_root():
+  i=1
+  while i<10:
+    print i
+    print square_root(i)
+    i=i+1
+
+# test_square_root()
+print square_root(3)

Chapter1to5.py

@@ -0,0 +1,29 @@
+'''
+Complete soltion of Book 
+"Python For Software Design by Allen B. Downey"
+by Harsh Bhatia ( www.harshbhatia.net )
+'''
+'''
+Exercise 1.1 :
+Write a well-structured English sentence with invalid tokens in it. Then write another
+ sentence with all valid tokens but with invalid structure.
+Sol:
+ I have $22 in my pocket.
+Total Profit = $-100 .
+
+Exercise 2.1 :
+Sol:
+010 = 8
+0100 = 64
+01000 = 512
+01001 = 513
+
+.
+.
+.
+
+NOTE :
+Chapter 1- 5 do not cotain any queations that might put a little strain on brain, so are not included in this solution book, If you are stuck in one please let me know.
+
+'''
+