Python: float() function
float() function
The float() function is used to convert the specified value into a floating point number.
Note: If the argument is a string, it should contain a decimal number, optionally preceded by a sign, and optionally embedded in whitespace. The optional sign may be '+' or '-'; a '+' sign has no effect on the value produced. The argument may also be a string representing a NaN (not-a-number), or a positive or negative infinity. The following grammar after leading and trailing whitespace characters are removed:
sign ::= "+" | "-" infinity ::= "Infinity" | "inf" nan ::= "nan" numeric_value ::= floatnumber | infinity | nan numeric_string ::= [sign] numeric_value
Return value :
If no argument is given, 0.0 is returned.
Version
(Python 3.2.5)
Syntax:
float([x])
Return value:
Floating point number, if no argument is given, 0.0 is returned.
Example: Python float() function
# for floats
print(float(2.25))
# for string floats with whitespaces
print(float(" -12345\n"))
# for string floats
print(float("-15.55"))
print(float("1e-005"))
print(float("+1E7"))
print(float("-Infinity"))
Output:
2.25 -12345.0 -15.55 1e-05 10000000.0 -inf
Pictorial Presentation:
The float type is described in Numeric Types — int, float, complex.
Python Code Editor:
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Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
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