Adding Warmup-1

Author: Jem Chang

README.md

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+## Practicing Python Programming in [CodingBat](http://codingbat.com/python)
+1. Warmup-1
+2. Warmup-2
+3. Logic-1
+4. Logic-2
+5. String-1
+6. String-2
+7. List-1
+8. List-2

Warmup-1/.DS_Store

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+"""
+Given an int n, return the absolute difference between n and 21,
+except return double the absolute difference if n is over 21.
+"""
+def diff21(n):
+  if n > 21:
+    return 2*abs(n-21)
+  else:
+    return abs(n-21)

Warmup-1/diff21.py

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+"""
+Given a string, we'll say that the front is the first 3 chars of the string.
+If the string length is less than 3, the front is whatever is there.
+Return a new string which is 3 copies of the front.
+"""
+def front3(str):
+  if len(str) < 3:
+    return str+str+str
+  else:
+    return str[0:3]+str[0:3]+str[0:3]

Warmup-1/front3.py

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+"""
+Given a string, return a new string where the first and last chars have been exchanged.
+"""
+def front_back(x):
+  if len(x) <= 1:
+    return x
+  mid = x[1:len(x)-1]
+  return x[-1] + mid + x[0]
+  

Warmup-1/front_back.py

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+"""
+Given 2 ints, a and b, return True if one if them is 10 or if their sum is 10.
+"""
+def makes10(a, b):
+  if a == 10 or b == 10 or a+b == 10:
+    return True
+  else:
+    return False

Warmup-1/makes10.py

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+"""
+Given a non-empty string and an int n, return a new string where the char at index n has been removed.
+The value of n will be a valid index of a char in the original string
+(i.e. n will be in the range 0..len(str)-1 inclusive).
+"""
+def missing_char(x, n):
+  allstr = str()
+  for i in range(len(x)):
+    if i == n: continue
+    allstr = allstr + x[i]
+  return allstr

Warmup-1/missing_char.py

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+"""
+We have two monkeys, a and b, and the parameters a_smile and b_smile indicate if each is smiling.
+We are in trouble if they are both smiling or if neither of them is smiling. Return True if we are in trouble.
+"""
+def monkey_trouble(a_smile, b_smile):
+  if a_smile == True and b_smile == True:
+    return True
+  elif a_smile == False and b_smile == False:
+    return True
+  else:
+    return False

Warmup-1/monkey_trouble.py

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+"""
+Given an int n, return True if it is within 10 of 100 or 200.
+Note: abs(num) computes the absolute value of a number.
+"""
+def near_hundred(n):
+  if  n >= (100-10) and n <= (100+10):
+    return True
+  elif n >= (200-10) and n <= (200+10):
+    return True
+  else:
+    return False

Warmup-1/near_hundred.py

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+"""
+Given a string, return a new string where "not " has been added to the front.
+However, if the string already begins with "not", return the string unchanged.
+"""
+def not_string(str):
+  if str.startswith('not'):
+    return str
+  else:
+    return 'not '+str

Warmup-1/not_string.py

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+"""
+We have a loud talking parrot. The "hour" parameter is the current hour time in the range 0..23.
+We are in trouble if the parrot is talking and the hour is before 7 or after 20.
+Return True if we are in trouble.
+"""
+def parrot_trouble(talking, hour):
+  if talking == True and (hour < 7 or hour > 20):
+    return True
+  else:
+    return False

Warmup-1/parrot_trouble.py

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+"""
+Given 2 int values, return True if one is negative and one is positive.
+Except if the parameter "negative" is True, then return True only if both are negative.
+"""
+def pos_neg(a, b, negative):
+  if a > 0 and b < 0:
+    if negative == False:
+      return True
+    if negative == True:
+      return False
+  if a < 0 and b > 0:
+    if negative == True:
+      return False
+    if negative == False:
+      return True
+  if a < 0 and b < 0 and negative == True:
+    return True
+  else:
+    return False

Warmup-1/pos_neg.py

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+"""
+The parameter weekday is True if it is a weekday, and the parameter vacation is True if we are on vacation.
+We sleep in if it is not a weekday or we're on vacation. Return True if we sleep in.
+"""
+def sleep_in(weekday, vacation):
+  if weekday == True and vacation != True:
+    return False
+  if weekday != True and vacation == True:
+    return True
+  if weekday == True and vacation == True:
+    return True
+  if weekday == False and vacation == False:
+    return True

Warmup-1/sleep_in.py

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+def sum_double(a, b):
+  if a !=b:
+    return a+b
+  else:
+    return 2*(a+b)