Day_15.py

#!/usr/bin/env python
# coding: utf-8

# # 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._**
# 
# ---
# 
# 
# 
# **Solutions:**

# In[1]:


import re

email = "john@google.com elise@python.com"
pattern = "\w+@(\w+).com"
ans = re.findall(pattern, email)
print(ans)


# ---
# 
# # 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._**
# 
# ---
# 
# 
# 
# **Solutions:**

# In[2]:


import re

email = input()
pattern = "\d+"
ans = re.findall(pattern, email)
print(ans)


# **OR**

# In[3]:


email = input().split()
ans = []
for word in email:
    if word.isdigit():  # can also use isnumeric() / isdecimal() function instead
        ans.append(word)
print(ans)


# **OR**

# In[ ]:


email = input().split()
ans = [word for word in email if word.isdigit()]  # using list comprehension method
print(ans)


# ---
# 
# # Question 56
# 
# ### **Question**
# 
# > **_Print a unicode string "hello world"._**
# 
# ---
# 
# ### Hints
# 
# > **_Use u'strings' format to define unicode string._**
# 
# ---
# 
# 
# 
# # 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()/encode() function to convert._**
# 
# ---
# 
# 
# 
# **Solutions:**

# In[ ]:


s = input()
u = s.encode("utf-8")
print(u)


# ---
# 
# # Question 58
# 
# ### **Question**
# 
# > **_Write a special comment to indicate a Python source code file is in unicode._**
# 
# ---
# 
# ### Hints
# 
# > **_Use unicode() function to convert._**
# 
# ---
# 
# **Solution:**

# In[ ]:


# -*- 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.Even if not converted it wont cause a problem because python by default understands the data type of a value_**
# 
# ---
# 
# 
# 
# **Solutions:**

# In[ ]:


n = int(input())
sum = 0
for i in range(1, n + 1):
    sum += i / (i + 1)
print(round(sum, 2))  # rounded to 2 decimal point


# ---