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Status/Day_19.md

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+
+# Question 75
+
+### **Question**
+
+>***Please write a program to randomly print a integer number between 7 and 15 inclusive.***
+
+
+----------------------
+### Hints 
+> ***Use random.randrange() to a random integer in a given range.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+import random
+print random.randrange(7,16)
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+
+# Question 76
+
+### **Question**
+
+>***Please write a program to compress and decompress the string "hello world!hello world!hello world!hello world!".***
+
+----------------------
+### Hints 
+> ***Use zlib.compress() and zlib.decompress() to compress and decompress a string.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+import zlib
+s = 'hello world!hello world!hello world!hello world!'
+t = zlib.compress(s)
+print t
+print zlib.decompress(t)
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+# Question 77
+
+### **Question**
+
+>***Please write a program to print the running time of execution of "1+1" for 100 times.***
+
+----------------------
+### Hints 
+>***Use timeit() function to measure the running time.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+
+from timeit import Timer
+t = Timer("for i in range(100):1+1")
+print t.timeit()
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+# Question 78
+
+### **Question**
+
+>***Please write a program to shuffle and print the list [3,6,7,8].***
+
+----------------------
+### Hints 
+> ***Use shuffle() function to shuffle a list.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+
+from random import shuffle
+li = [3,6,7,8]
+shuffle(li)
+print li
+
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+
+# Question 79
+
+### **Question**
+
+>***Please write a program to generate all sentences where subject is in ["I", "You"] and verb is in ["Play", "Love"] and the object is in ["Hockey","Football"].***
+
+
+----------------------
+### Hints 
+> ***Use list[index] notation to get a element from a list.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+
+subjects=["I", "You"]
+verbs=["Play", "Love"]
+objects=["Hockey","Football"]
+for i in range(len(subjects)):
+    for j in range(len(verbs)):
+        for k in range(len(objects)):
+            sentence = "%s %s %s." % (subjects[i], verbs[j], objects[k])
+            print sentence
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+

Status/Day_20.md

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+
+# Question 80
+
+### **Question**
+
+>***Please write a program to print the list after removing delete even numbers in [5,6,77,45,22,12,24].***
+
+
+----------------------
+### Hints 
+> ***Use list comprehension to delete a bunch of element from a list.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+li = [5,6,77,45,22,12,24]
+li = [x for x in li if x%2!=0]
+print li
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+
+# Question 81
+
+### **Question**
+
+>***By using list comprehension, please write a program to print the list after removing delete numbers which are divisible by 5 and 7 in [12,24,35,70,88,120,155].***
+
+----------------------
+### Hints 
+> ***Use list comprehension to delete a bunch of element from a list.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+li = [12,24,35,70,88,120,155]
+li = [x for x in li if x%5!=0 and x%7!=0]
+print li
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+# Question 82
+
+### **Question**
+
+>***By using list comprehension, please write a program to print the list after removing the 0th, 2nd, 4th,6th numbers in [12,24,35,70,88,120,155].***
+
+----------------------
+### Hints 
+>***Use list comprehension to delete a bunch of element from a list.
+Use enumerate() to get (index, value) tuple.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+
+li = [12,24,35,70,88,120,155]
+li = [x for (i,x) in enumerate(li) if i%2!=0]
+print li
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+# Question 83
+
+### **Question**
+
+>***By using list comprehension, please write a program to print the list after removing the 0th, 2nd, 4th,6th numbers in [12,24,35,70,88,120,155].***
+
+----------------------
+### Hints 
+> ***Use list comprehension to delete a bunch of element from a list.
+Use enumerate() to get (index, value) tuple.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+
+li = [12,24,35,70,88,120,155]
+li = [x for (i,x) in enumerate(li) if i%2!=0]
+print li
+
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+
+# Question 84
+
+### **Question**
+
+>***By using list comprehension, please write a program generate a 3*5*8 3D array whose each element is 0.***
+
+
+----------------------
+### Hints 
+> ***Use list comprehension to make an array.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+
+array = [[ [0 for col in range(8)] for col in range(5)] for row in range(3)]
+print array
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+