How do I check if a string represents a number in Python?
To check if a string represents a number (float or int) in Python, you can try casting it to a float or int and check if the cast was successful. If the string can't be cast, then it is not a number.
Here is an example:
def is_number(s):
try:
float(s)
return True
except ValueError:
return False
print(is_number('123')) # True
print(is_number('123.456')) # True
print(is_number('123a')) # False
print(is_number('abc')) # False
Alternatively, you can use the isdigit
method of strings:
def is_number(s):
return s.isdigit()
print(is_number('123')) # True
print(is_number('123.456')) # False
print(is_number('123a')) # False
print(is_number('abc')) # False
Note that the isdigit
method will only return True
for strings that consist only of digits and that do not have a decimal point. It will return False
for strings like '123.456'
or '123a'
.
-
How to convert string into datetime in Python?
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How do I pad a string with zeroes in Python?
You can pad a string with zeros in Python by using the zfill() method. This method adds zeros to the left of the string until it reaches the specified length. Here's an example: s = '123' padded = ...
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How to check if the string is empty in Python?
To check if a string is empty in Python, you can use the len() function. For example: string = "" if len(string) == 0: print("The string is empty") You can also use the not operator to check if...
Questions -
How do I get a substring of a string in Python?
To get a substring of a string in Python, you can use the string slicing notation, which is string[start:end], where start is the index of the first character of the substring, and end is the index...
Questions
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