Update Day_15.md

Author: darkprinx

Status/Day_15.md

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+
+# Question 54
+
+### **Question**
+
+> ***Assuming that we have some email addresses in the "username@companyname.com" format, please write program to print the company name of a given email address. Both user names and company names are composed of letters only.***
+
+> ***Example:
+If the following email address is given as input to the program:***
+```
+john@google.com
+```
+> ***Then, the output of the program should be:***
+```
+google
+```
+> ***In case of input data being supplied to the question, it should be assumed to be a console input.***
+
+----------------------
+### Hints 
+> ***Use \w to match letters.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+import re
+emailAddress = raw_input()
+pat2 = "(\w+)@(\w+)\.(com)"
+r2 = re.match(pat2,emailAddress)
+print r2.group(2)
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+# Question 55
+
+### **Question**
+
+>***Write a program which accepts a sequence of words separated by whitespace as input to print the words composed of digits only.***
+
+>***Example:
+If the following words is given as input to the program:***
+```
+2 cats and 3 dogs.
+```
+>***Then, the output of the program should be:***
+```
+['2', '3']
+```
+>***In case of input data being supplied to the question, it should be assumed to be a console input.***
+
+
+----------------------
+### Hints 
+> ***Use re.findall() to find all substring using regex.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+import re
+s = raw_input()
+print re.findall("\d+",s)
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+
+
+# Question 56
+
+### **Question**
+
+> ***Print a unicode string "hello world".***
+
+----------------------
+### Hints 
+> ***Use u'strings' format to define unicode string.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+unicodeString = u"hello world!"
+print unicodeString
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+# Question 57
+
+### **Question**
+
+> ***Write a program to read an ASCII string and to convert it to a unicode string encoded by utf-8.***
+
+----------------------
+### Hints 
+> ***Use unicode() function to convert.***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+s = raw_input()
+u = unicode( s ,"utf-8")
+print u
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------
+
+# Question 58
+
+### **Question**
+
+> ***Write a special comment to indicate a Python source code file is in unicode.***
+
+----------------------
+### Hints 
+> ***Use unicode() function to convert.***
+
+----------------------
+
+**Solution:**
+```python
+# -*- coding: utf-8 -*-
+```
+----------------
+# Question 59
+
+### **Question**
+
+>***Write a program to compute 1/2+2/3+3/4+...+n/n+1 with a given n input by console (n>0).***
+
+>***Example:
+If the following n is given as input to the program:***
+```
+5
+```
+>***Then, the output of the program should be:***
+```
+3.55
+```
+>***In case of input data being supplied to the question, it should be assumed to be a console input.***
+
+
+----------------------
+### Hints 
+> ***Use float() to convert an integer to a float***
+
+----------------------
+
+**Main author's Solution: Python 2**
+```python
+n=int(raw_input())
+sum=0.0
+for i in range(1,n+1):
+ sum += float(float(i)/(i+1))
+print sum
+```
+----------------
+**My Solution: Python 3**
+```python
+#to be written
+
+```
+---------------------