Home
Q&A
Education
Technology
Credit
General
Health
Insurance
Questions
Ask a Question
How do I check if a string is a number (float)?
Home
Education
How do I check if a string is a number (float)?
asked
Jan 22, 2022
in
Education
by
JackTerrance
Can someone tell me a method to check how can I represent a string as a number in Python? I am using this function right now: def is_number(s): try: float(s) return True except ValueError: return False This method is slow and clunky. So please help me with it. Select the correct answer from above options
python
casting
type-conversion
python-faq
1
Answer
0
votes
answered
Jan 22, 2022
by
JackTerrance
Best answer
It's wrong to say that method is "slow and clunky", but if you want another method then use isdigit() function: >>> q = "14634" >>> q.isdigit() True >>> w = "074spam" >>> w.isdigit() False You can use unicode too, but that's your own preference.
Related questions
0
votes
Q: How do I parse a string to a float or int in Python?
How can someone parse a numeric string like "121.5555" to it's corresponding float value 121.5555? or parse a ... str to an int. Select the correct answer from above options...
asked
Jan 21, 2022
in
Education
by
JackTerrance
floating-point
parsing
python
python-faq
0
votes
Q: How do I check if a list is empty?
suppose I have passed : list=[] How can I check if a list is empty or not? Select the correct answer from above options...
asked
Jan 24, 2022
in
Education
by
JackTerrance
list
python
python-faq
0
votes
Q: How do I check what version of Python is running my script?
How to check which Python version is interpreting my script? Select the correct answer from above options...
asked
Jan 23, 2022
in
Education
by
JackTerrance
python-faq
python
interpreter
script
0
votes
Q: How do I check whether a file exists without exceptions?
Can we check the existence of a file without using try statement in Python? Select the correct answer from above options...
asked
Jan 21, 2022
in
Education
by
JackTerrance
file-exist
python
python-faq
0
votes
Q: How do I lowercase a string in Python?
How can I convert a str from uppercase, or half uppercase to lowercase? E.x. "Decimeter" to "decimeter" Select the correct answer from above options...
asked
Jan 24, 2022
in
Education
by
JackTerrance
python
python-faq
string
uppercase
0
votes
Q: How do I trim whitespace from a Python string?
In Python, How to remove trailing and leading whitespace from str ? For instance check this: " Hey" --> "Hey" " ... "Harsh has a dog" Select the correct answer from above options...
asked
Jan 23, 2022
in
Education
by
JackTerrance
python-faq
python
trim
0
votes
Q: How do I get the number of elements in a list in Python?
How can I get the number of elements of a list? Ex- items = [] items.append("one") items.append("two") items.append("three") Select the correct answer from above options...
asked
Jan 24, 2022
in
Education
by
JackTerrance
python
python-faq
list
0
votes
Q: Check if a given key already exists in a dictionary
How can I check if a key exists in a directory in Python, before updating the value of the key. I tried this ... better way to do this? Select the correct answer from above options...
asked
Jan 21, 2022
in
Education
by
JackTerrance
python
python-faq
directory
0
votes
Q: Convert hex string to int in Python
How do I convert a hex string to an int in Python? I may have it as "0xffff" or just "ffff". Select the correct answer from above options...
asked
Jan 27, 2022
in
Education
by
JackTerrance
type-conversion
python-datatypes
0
votes
Q: How do I use raw_input in Python 3
I want to freeze the dos pop-up, I already tried raw-input as mentioned in my study material of Python 2.6 and ... (3**200) raw_input() Select the correct answer from above options...
asked
Jan 23, 2022
in
Education
by
JackTerrance
python-faq
python
raw_input
0
votes
Q: How do I connect to a MySQL Database in Python?
I want to use python to connect to a MySQL database, how can I do that? Select the correct answer from above options...
asked
Jan 23, 2022
in
Education
by
JackTerrance
mysql
python
python-faq
0
votes
Q: How do I trim whitespace?
How can I trim whitespace using python, I want to delete all spaces and tabs? For E.x. \t AT\t → At Select the correct answer from above options...
asked
Jan 22, 2022
in
Education
by
JackTerrance
whitespace
trim
python
python-faq
0
votes
Q: How do I remove an element from a list by index in Python?
How to remove an element from a list by index in Python, I tried list.remove method but it search the list and ... How can I do this? Select the correct answer from above options...
asked
Jan 22, 2022
in
Education
by
JackTerrance
python
python-faq
list
0
votes
Q: How do I pass a variable by reference?
There is no explanation in python documentation whether parameters are passed by value or reference and why the ... actual reference? Select the correct answer from above options...
asked
Jan 21, 2022
in
Education
by
JackTerrance
pass-by-reference
python
python-faq
parameter-passing
parameters
0
votes
Q: How do I install pip on Windows?
I read that pip is a replacement for easy_install, Can anyone tell me, How can I install pip using ... another better option? Select the correct answer from above options...
asked
Jan 21, 2022
in
Education
by
JackTerrance
python
pip
easy-install
python-faq
...