day 15 code is updated

Author: darkprinx

Status/Day_15.md

@@ -34,8 +34,12 @@ print r2.group(2)
 ----------------
 **My Solution: Python 3**
 ```python
-#to be written
+import re
 
+email = "[email protected] [email protected]"
+pattern = "\w+@(\w+).com"
+ans = re.findall(pattern,email)
+print(ans)
 ```
 ---------------------
 
@@ -73,8 +77,27 @@ print re.findall("\d+",s)
 ----------------
 **My Solution: Python 3**
 ```python
-#to be written
+import re
 
+email = input()
+pattern = "\d+"
+ans = re.findall(pattern,email)
+print(ans)
+```
+**OR**
+```python
+email = input().split()
+ans = []
+for word in email:
+    if word.isdigit():     # can also use isnumeric() / isdecimal() function instead
+       ans.append(word)
+print(ans)
+```
+**OR**
+```python
+email = input().split()
+ans = [word for word in email if word.isdigit()]  # using list comprehension method
+print(ans)
 ```
 ---------------------
 
@@ -98,12 +121,6 @@ unicodeString = u"hello world!"
 print unicodeString
 ```
 ----------------
-**My Solution: Python 3**
-```python
-#to be written
-
-```
----------------------
 
 # Question 57
 
@@ -113,7 +130,7 @@ print unicodeString
 
 ----------------------
 ### Hints 
-> ***Use unicode() function to convert.***
+> ***Use unicode()/encode() function to convert.***
 
 ----------------------
 
@@ -126,8 +143,9 @@ print u
 ----------------
 **My Solution: Python 3**
 ```python
-#to be written
-
+s = input()
+u = s.encode('utf-8')
+print(u)
 ```
 ---------------------
 
@@ -168,7 +186,7 @@ If the following n is given as input to the program:***
 
 ----------------------
 ### Hints 
-> ***Use float() to convert an integer to a float***
+> ***Use float() to convert an integer to a float.Even if not converted it wont cause a problem because python by default understands the data type of a value***
 
 ----------------------
 
@@ -183,7 +201,10 @@ print sum
 ----------------
 **My Solution: Python 3**
 ```python
-#to be written
-
+n = int(input())
+sum = 0
+for i in range(1, n+1):
+    sum+= i/(i+1)
+print(sum)
 ```
 ---------------------