I'm trying to create a function that will identify if 0 is the first number in an alphanumeric sequence; for example, the function should evaluate to True if given the string "J02". I came up with a for loop that would work for inputs that are alphanumeric but not strictly alpha inputs.
x = "J02"
def not_starting_zero(m):
zero_string = []
for char in m:
if char.isdigit() == True:
zero_string.append(char)
if m[len(m)-1] == char:
if zero_string[0] == "0":
return False
else:
return True
not_starting_zero(x)
I tried using an else statement that aligned with the indentation of the if char.isdigit() == True: ; but that would make the return of the function true if the first index of the string is a letter.
You could use a regular expression to find the first digit:
import re
def not_starting_zero(m):
first_digit = re.search(r"([0-9])", m)
if first_digit:
return first_digit.group(0) == "0"
else:
return False
Alternatively, you could use your looping version - I think you can just stop after you encounter the first digit:
x = "J02"
def not_starting_zero(m):
for char in m:
if char.isdigit() == True:
if char == "0":
return True
# otherwise, return False
return False
# if we get here, there weren't any numbers
return False
not_starting_zero(x)
I suppose you could use regex and extract the numeric digits into a list. Something like this -
import re
def not_starting_zero(m):
numbers = re.findall('[0-9]', m)
if numbers[0] == '0':
return false
else
return true
I'm assuming you mean the first digit you find is 0 (because otherwise it should return False for "J02" because 02 is the first number)
x = "J02"
def not_starting_zero(m):
for char in m:
if char.isdigit() == True:
if char == "0":
return True
else:
return False
return False
not_starting_zero(x)
This works because once return is executed in a function the rest of the function is not executed. Hope this clears up your doubt.
You don't need to make an array of the digits because you only need to check the first digit in the string; if its a 0 then return True else return False.
Below code can find if 0 is the first number in alphanumeric string.
import regex as re
x = "J02"
True if re.findall('[0-9]', x)[0] == '0' else False
Output:
True
Take note on type safety, how expressive the code is, and how it instills referential transparency for code correctness (accuracy). All those loops cause too many mutations, and mutations cause errors (bugs). See here for referential transparency.
import re
str1 = 'jdh487y3hef8ty483rhfeih89t4389jf0dwiefh38uth'
str2 = '0dh487y3hef8ty483rhfeih89t4389jfdwiefh38uth'
# check if a given char is first in letter in string
def check_for_char(alpha_num:str, _char) -> bool:
if re.search('0', alpha_num).span(0)[0] == _char:
return True
else:
return False
is_false = check_for_char(
alpha_num=str1,
_char=0
)
is_true = check_for_char(
alpha_num=str2,
_char=0
)
print(is_false) # False
print(is_true) # True
# search if a given char exists at all within the alphanum str
print(str1[re.search('0', str1).span(0)[0]]) # 0
I'm trying to check for a palindrome with Python. The code I have is very for-loop intensive.
And it seems to me the biggest mistake people do when going from C to Python is trying to implement C logic using Python, which makes things run slowly, and it's just not making the most of the language.
I see on this website. Search for "C-style for", that Python doesn't have C-style for loops. Might be outdated, but I interpret it to mean Python has its own methods for this.
I've tried looking around, I can't find much up to date (Python 3) advice for this. How can I solve a palindrome challenge in Python, without using the for loop?
I've done this in C in class, but I want to do it in Python, on a personal basis. The problem is from the Euler Project, great site By the way,.
def isPalindrome(n):
lst = [int(n) for n in str(n)]
l=len(lst)
if l==0 || l==1:
return True
elif len(lst)%2==0:
for k in range (l)
#####
else:
while (k<=((l-1)/2)):
if (list[]):
#####
for i in range (999, 100, -1):
for j in range (999,100, -1):
if isPalindrome(i*j):
print(i*j)
break
I'm missing a lot of code here. The five hashes are just reminders for myself.
Concrete questions:
In C, I would make a for loop comparing index 0 to index max, and then index 0+1 with max-1, until something something. How to best do this in Python?
My for loop (in in range (999, 100, -1), is this a bad way to do it in Python?
Does anybody have any good advice, or good websites, or resources for people in my position? I'm not a programmer, I don't aspire to be one, I just want to learn enough so that when I write my bachelor's degree thesis (electrical engineering), I don't have to simultaneously LEARN an applicable programming language while trying to obtain good results in the project. "How to go from basic C to great application of Python", that sort of thing.
Any specific bits of code to make a great solution to this problem would also be appreciated, I need to learn good algorithms.. I am envisioning 3 situations. If the value is zero or single digit, if it is of odd length, and if it is of even length. I was planning to write for loops...
PS: The problem is: Find the highest value product of two 3 digit integers that is also a palindrome.
A pythonic way to determine if a given value is a palindrome:
str(n) == str(n)[::-1]
Explanation:
We're checking if the string representation of n equals the inverted string representation of n
The [::-1] slice takes care of inverting the string
After that, we compare for equality using ==
An alternative to the rather unintuitive [::-1] syntax is this:
>>> test = "abcba"
>>> test == ''.join(reversed(test))
True
The reversed function returns a reversed sequence of the characters in test.
''.join() joins those characters together again with nothing in between.
Just for the record, and for the ones looking for a more algorithmic way to validate if a given string is palindrome, two ways to achieve the same (using while and for loops):
def is_palindrome(word):
letters = list(word)
is_palindrome = True
i = 0
while len(letters) > 0 and is_palindrome:
if letters[0] != letters[(len(letters) - 1)]:
is_palindrome = False
else:
letters.pop(0)
if len(letters) > 0:
letters.pop((len(letters) - 1))
return is_palindrome
And....the second one:
def is_palindrome(word):
letters = list(word)
is_palindrome = True
for letter in letters:
if letter == letters[-1]:
letters.pop(-1)
else:
is_palindrome = False
break
return is_palindrome
The awesome part of python is the things you can do with it. You don't have to use indexes for strings.
The following will work (using slices)
def palindrome(n):
return n == n[::-1]
What it does is simply reverses n, and checks if they are equal. n[::-1] reverses n (the -1 means to decrement)
"2) My for loop (in in range (999, 100, -1), is this a bad way to do it in Python?"
Regarding the above, you want to use xrange instead of range (because range will create an actual list, while xrange is a fast generator)
My opinions on question 3
I learned C before Python, and I just read the docs, and played around with it using the console. (and by doing Project Euler problems as well :)
Below the code will print 0 if it is Palindrome else it will print -1
Optimized Code
word = "nepalapen"
is_palindrome = word.find(word[::-1])
print is_palindrome
Output:
0
word = "nepalapend"
is_palindrome = word.find(word[::-1])
print is_palindrome
Output:
-1
Explaination:
when searching the string the value that is returned is the value of the location that the string starts at.
So when you do word.find(word[::-1]) it finds nepalapen at location 0 and [::-1] reverses nepalapen and it still is nepalapen at location 0 so 0 is returned.
Now when we search for nepalapend and then reverse nepalapend to dnepalapen it renders a FALSE statement nepalapend was reversed to dnepalapen causing the search to fail to find nepalapend resulting in a value of -1 which indicates string not found.
Another method print true if palindrome else print false
word = "nepalapen"
print(word[::-1]==word[::1])
output:
TRUE
There is also a functional way:
def is_palindrome(word):
if len(word) == 1: return True
if word[0] != word[-1]: return False
return is_palindrome(word[1:-1])
I know that this question was answered a while ago and i appologize for the intrusion. However,I was working on a way of doing this in python as well and i just thought that i would share the way that i did it in is as follows,
word = 'aibohphobia'
word_rev = reversed(word)
def is_palindrome(word):
if list(word) == list(word_rev):
print'True, it is a palindrome'
else:
print'False, this is''t a plindrome'
is_palindrome(word)
There is much easier way I just found. It's only 1 line.
is_palindrome = word.find(word[::-1])
The most pythonic way to do this is indeed using the slicing notation to reverse the string as mentioned already:
def is_palindrome(string: str) -> bool:
return string == string[::-1]
In some other occasions though (like technical interviews), you may have to write a "proper" algorithm to find the palindrome. In this case, the following should do the trick:
def is_palindrome(string: str) -> bool:
start = 0
end = len(string) - 1
while end >= start:
if string[end] != string[start]:
return False
start += 1
end -= 1
return True
Set pointers to the start and end of the string
Iterate while end exceeds start
If the character in end and start indices don't match then this is not a palindrome, otherwise keep comparing
Increase start pointer by 1
Decrease end pointer by 1
Test Cases:
import unittest
class Test(unittest.TestCase):
palindromes = ['a', 'aa', 'aba', '12321']
non_palindromes = ['ab', 'aab', 'cacacc']
def test_is_palindrome(self):
for case in self.palindromes:
self.assertTrue(is_palindrome(case))
for case in self.non_palindromes:
self.assertFalse(is_palindrome(case))
if __name__ == '__main__':
unittest.main()
You could use this one-liner that returns a bool value:
str(x)==str(x)[::-1]
This works both for words and numbers thanks to the type casting...
Here a case insensitive function since all those solutions above are case sensitive.
def Palindrome(string):
return (string.upper() == string.upper()[::-1])
This function will return a boolean value.
doing the Watterloo course for python, the same questions is raised as a "Lesseon" find the info here:
http://cscircles.cemc.uwaterloo.ca/13-lists/
being a novice i solved the problem the following way:
def isPalindrome(S):
pali = True
for i in range (0, len(S) // 2):
if S[i] == S[(i * -1) - 1] and pali is True:
pali = True
else:
pali = False
print(pali)
return pali
The function is called isPalindrome(S) and requires a string "S".
The return value is by default TRUE, to have the initial check on the first if statement.
After that, the for loop runs half the string length to check if the character from string "S" at the position "i" is the same at from the front and from the back.
If once this is not the case, the function stops, prints out FALSE and returns false.
Cheers.kg
If the string has an uppercase or non-alphabetic character then the function converts all characters to lowercase and removes all non-alphabetic characters using regex finally it applies palindrome check recursively:
import re
rules = [
lambda s: any(x.isupper() for x in s),
lambda s: not s.isalpha()
]
def is_palindrome(s):
if any(rule(s) for rule in rules):
s = re.sub(r'[^\w]', '', s).lower()
if len(s) < 2:
return True
if s[0] != s[-1]:
return False
return is_palindrome(s[1:-1])
string = 'Are we not drawn onward, we few, drawn onward to new era?'
print(is_palindrome(string))
the output is True for the input above.
maybe you can try this one:
list=input('enter a string:')
if (list==list[::-1]):
print ("It is a palindrome")
else:
print("it is not palindrome")
You are asking palindrome in python. palindrome can be performed on strings, numbers and lists. However, I just posted a simple code to check palindrome of a string.
# Palindrome of string
str=raw_input("Enter the string\n")
ln=len(str)
for i in range(ln/2) :
if(str[ln-i-1]!=str[i]):
break
if(i==(ln/2)-1):
print "Palindrome"
else:
print "Not Palindrome"
The real easy way to do that it is
word = str(raw_input(""))
is_palindrome = word.find(word[::-1])
if is_palindrome == 0:
print True
else:
print False
And if/else here just for fancy looks. The question about palindrome was on Amazon's interview for QA
Assuming a string 's'
palin = lambda s: s[:(len(s)/2 + (0 if len(s)%2==0 else 1)):1] == s[:len(s)/2-1:-1]
# Test
palin('654456') # True
palin('malma') # False
palin('ab1ba') # True
word = "<insert palindrome/string>"
reverse = word[::-1]
is_palindrome = word.find(reverse)
print is_palindrome
This was a question in Udacity comp 101, chapter 1. Gives a 0 for palindrome gives a -1 for not. Its simple, and does not use loops.
I wrote this code:
word = input("enter: ")
word = ''.join(word.split())`
for x in range(len(word)):
if list(word)[x] == ((list(word)[len(word)-x-1])):
if x+1 == len(word):
print("its pali")
and it works.
it gets the word, then removes the spaces and turns it into a list
then it tests if the first letter is equal to the last and if the 2nd is equal to 2nd last and so on.
then the 'if x+1 == len(word)' means that since x starts at 0 it becomes 1 and then for every next .. blah blah blah it works so it works.
#compare 1st half with reversed second half
# i.e. 'abba' -> 'ab' == 'ba'[::-1]
def is_palindrome( s ):
return True if len( s ) < 2 else s[ :len( s ) // 2 ] == s[ -( len( s ) // 2 ):][::-1]
You can use Deques in python to check palindrome
def palindrome(a_string):
ch_dequeu = Deque()
for ch in a_string:
ch_dequeu.add_rear(ch)
still_ok = True
while ch_dequeu.size() > 1 and still_ok:
first = ch_dequeu.remove_front()
last = ch_dequeu.remove_rear()
if first != last:
still_ok = False
return still_ok
class Deque:
def __init__(self):
self.items = []
def is_empty(self):
return self.items == []
def add_rear(self, item):
self.items.insert(0, item)
def add_front(self, item):
self.items.append(item)
def size(self):
return len(self.items)
def remove_front(self):
return self.items.pop()
def remove_rear(self):
return self.items.pop(0)
import string
word = input('Please select a word to test \n')
word = word.lower()
num = len(word)
x = round((len(word)-1)/2)
#defines first half of string
first = word[:x]
#reverse second half of string
def reverse_odd(text):
lst = []
count = 1
for i in range(x+1, len(text)):
lst.append(text[len(text)-count])
count += 1
lst = ''.join(lst)
return lst
#reverse second half of string
def reverse_even(text):
lst = []
count = 1
for i in range(x, len(text)):
lst.append(text[len(text)-count])
count += 1
lst = ''.join(lst)
return lst
if reverse_odd(word) == first or reverse_even(word) == first:
print(string.capwords(word), 'is a palindrome')
else:
print(string.capwords(word), 'is not a palindrome')
the "algorithmic" way:
import math
def isPalindrome(inputString):
if inputString == None:
return False
strLength = len(inputString)
for i in range(math.floor(strLength)):
if inputString[i] != inputString[strLength - 1 - i]:
return False
return True
There is another way by using functions, if you don't want to use reverse
#!/usr/bin/python
A = 'kayak'
def palin(A):
i = 0
while (i<=(A.__len__()-1)):
if (A[A.__len__()-i-1] == A[i]):
i +=1
else:
return False
if palin(A) == False:
print("Not a Palindrome")
else :
print ("Palindrome")
It looks prettier with recursion!
def isPalindrome(x):
z = numToList(x)
length = math.floor(len(z) / 2)
if length < 2:
if z[0] == z[-1]:
return True
else:
return False
else:
if z[0] == z[-1]:
del z[0]
del z[-1]
return isPalindrome(z)
else:
return False
def is_palindrome(string):
return string == ''.join([letter for letter in reversed(string)])
print ["Not a palindrome","Is a palindrome"][s == ''.join([s[len(s)-i-1] for i in range(len(s))])]
This is the typical way of writing single line code
def pali(str1):
l=list(str1)
l1=l[::-1]
if l1==l:
print("yess")
else:
print("noo")
str1="abc"
a=pali(str1)
print(a)
I tried using this:
def palindrome_numer(num):
num_str = str(num)
str_list = list(num_str)
if str_list[0] == str_list[-1]:
return True
return False
and it worked for a number but I don't know if a string
def isPalin(checkWord):
Hsize = len(lst)/2
seed = 1
palind=True
while seed<Hsize+1:
#print seed,lst[seed-1], lst [-(seed)]
if(lst[seed-1] != lst [-seed]):
palind = False
break
seed = seed+1
return palind
lst = 'testset'
print lst, isPalin(lst)
lst = 'testsest'
print lst, isPalin(lst)
Output
testset True
testsest False
I am trying to solve a python programming challenge that requires a program for checking if a string is binary. If the string is binary, it should return "true". Otherwise, it should return "false".
When I ran the code, it iterates through the string and prints either "true" or "false" depending on whether the value in the string is "0" and "1" or not. Even though I have tried a couple of methods I keep ending up with a vertical display of the boolean values.
binary = {'0', '1'}
def is_binary(string):
for i in str(string):
if i in binary:
print('true')
else:
print('false')
break
is_binary('101010')
is_binary('101210')
How can I modify the code to be able to print a single "true" statement when the string is binary and a single "false" statement when the string is not binary regardless of the length of the string?
You do something like this:
def is_binary(str):
is_binary = True
try:
int(str, 2)
except ValueError:
is_binary = False
return is_binary
is_binary('0101010101010') # returns True
is_binary('24340101041042101010') # returns False
I have use int to convert to binary, Please refer here to learn
Try the below code:
def is_binary(bin_str):
if (set(bin_str) - set(['1','0'])):
return False
else:
return True
bin_str = "0110011"
print is_binary(bin_str)
bin_str = "011020"
print is_binary(bin_str)
Output:
True
False
Solution using OP's logic:
binary = {'0', '1'}
def is_binary(string):
for i in str(string):
if i in binary:
continue
else:
return False
return True
print is_binary('101010')
print is_binary('101210')
The problem in your code is that you are printing if every character was in binary set which is NOT what you want. You want to print true only if all the characters were in binary. So, you only need to print('true') at the end of the for loop.
So, This should do it:
binary = {'0', '1'}
def is_binary(string):
for i in str(string):
if i not in binary:
print('false')
return
print('true')
is_binary('101010')
is_binary('101210')
Short way
I stumble here and thought about this:
# Declare one true and one false vars
bb = '010010111010010001011100'
bb2 = '010010111010010001O11100' # there's a letter O here
bin_set = set('0','1') # A set with char '0' and char '1'
I also could have written bin_set = {'0','1'}
Then (I was in ipython 3):
In : set(bb) == bin_set
Out: True
In : set(bb2) == bin_set
Out: False
If a string is only composed with 0 and 1 then its set() will be equal to {'0','1'} (set representation in python)
hth
Okay so the following code is supposed to test whether or not r and b are alternating. So a test of "rbrbrb" would be accepted but "rbbrbbr" would not be accepted.
However my issue is that only tests the first two under def manufactoria()
def manufactoria():
test(alternating_colors, "")
test(alternating_colors, "r")
test(alternating_colors, "rb")
test(alternating_colors, "rbrbrbr")
test(alternating_colors, "b")
test(alternating_colors, "brbr")
test(alternating_colors, "brbrbrbr")
def alternating_colors(string):
length = len(string)
check = 0
if len(string) == 0 or len(string)==1:
return True
while check <= len(string)-1:
if string[check]+string[check+1] == "rr" or string[check]+string[check+1] == "bb":
return False
check +=1
def test(fn, string):
if fn(string):
result = "accepted"
else:
result = "not accepted"
print('The string "' + string + '" is ' + result)
manufactoria()
Here is the corrected version:
def alternating_colors(s):
length=len(s)
if length<2:
return True
for i in range(length-1):
curr_slice = s[i:i+2]
if curr_slice in ["rr", "bb"]:
return False
return True
This is basically using most of what Prune answered.
An even better solution is using regular expressions. This will find any repetition of either r or b:
import re
def alternating_colors(s):
if re.search(r"r{2,}|b{2,}", s):
return False
return True
It doesn't check all of your code because the "index out of range" exception kills your program.
Your index is out of range because you tried to access position 2 of a string of length 2: "rb" has indices 0 and 1, but you tried to check string[1] + string[1+1]. You need to stop your checking loop one index earlier, as one commenter already mentioned.
You can make this program shorter and easier to maintain if you learn to use these Python language features:
< (less than operator)
for statement (replaces your while and
increment loop)
string slicing (instead of concatenating individual
characters)
in operator (instead of checking individual locations)