Conversion between Python data types
##Function | Description |
int(x [,base]) |
Convert x to an integer
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long(x [,base] )
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Convert x to a long integer
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float(x)
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Convert x to a floating point number
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complex(real [,imag])
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Create a complex number
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str(x) |
Convert object x to string
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##repr(x) | Convert object x to an expression string |
eval(str) | Use to evaluate a valid Python expression in a string and return an object |
tuple(s) | Convert sequence s into a tuple |
list(s) | Convert sequence s into a list |
set(s) | Convert to a variable set |
dict(d) | Create a dictionary. d must be a sequence of (key, value) tuples. |
frozenset(s) | Convert to immutable collection |
chr(x) | Convert an integer to a character |
unichr( x) | Convert an integer to Unicode characters |
##ord(x)
Convert a character to its integer value |
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hex(x)
Convert a Convert an integer to a hexadecimal string |
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oct(x)
Convert an integer to a Octal string |
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View variable data type:
a=3
import types
type(a)
int(a) #Convert to integer type
str(a) #Convert to string
Python math function
Function
Return value (description) |
| abs(x)
Returns the absolute value of the number, such as abs(-10) returns 10 |
| ceil(x)
Return the upper integer of the number, such as math.ceil(4.1) returns 5 |
| cmp(x, y)
If x < y returns -1, If x == y, return 0, if x > y, return 1 |
| exp(x)
returns e raised to the x power (ex), such as math. exp(1) returns 2.718281828459045 |
| fabs(x)
returns the absolute value of the number, such as math.fabs(-10) returns 10.0 | | floor(x)
Returns the rounded integer of the number, such as math.floor(4.9) returns 4 |
| log(x)
For example, math.log(math.e) returns 1.0, math.log(100,10) returns 2.0 |
| log10(x)
returns The logarithm of x with base 10, such as math.log10(100) returns 2.0 |
| max(x1, x2,...)
returns the given parameters The maximum value of , the parameter can be a sequence. |
| min(x1, x2,...)
Returns the minimum value of the given parameter, which can be a sequence. |
| modf(x)
Returns the integer part and decimal part of x. The numerical signs of the two parts are the same as x, and the integer part is expressed in floating point type. |
| pow(x, y)
x**y Value after operation. |
| round(x [,n])
Returns the rounded value of the floating point number x. If the n value is given, it represents the number of digits rounded to the decimal point. . |
| sqrt(x)
Returns the square root of the number x. The number can be negative and the return type is real number. For example, math.sqrt(4) returns 2+0j |
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Python random number function
Function
Description |
| choice(seq)
Randomly select an element from the elements of the sequence, such as random.choice(range(10)), from 0 to 9 Pick an integer at random. |
| randrange ([start,] stop [,step])
Get a random number from the set in the specified range, incremented by the specified base, the base is default The value is 1 |
| random()
Randomly generates the next real number, which is in the range [0,1). |
| seed([x])
Change the seed of the random number generator. If you don't understand the principle, you don't have to set the seed specifically, Python will choose the seed for you. |
| shuffle(lst)
Randomly sort all elements of the sequence |
| uniform(x, y)
Randomly generate the next real number, which is in the range [x, y]. |
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