Methods of native types in Python
To help you manipulate native types in Python, Dataway supports the following common Python methods:
| Data Type | Method | Method Type | Feature | Output Type |
|---|---|---|---|---|
| str | endswith(suffix[, start[, end]]) | Method | Compares suffixes. | bool |
| split(sep=None, maxsplit=-1) | Method | Splits data. | list | |
| startswith(prefix[, start[, end]]) | Method | Compares the prefixes. | bool | |
| count(sub[, start[, end]]) | Method | Counts substrings. | int | |
| find(sub[, start[, end]]) | Method | Searches for matched substrings. | int | |
| format(*args, **kwargs) | Method | Formatting. | str | |
| index(sub[, start[, end]]) | Method | Indexes matched substrings. | int | |
| isascii() | Method | Returns whether the data has only ASCII characters. | bool | |
| isspace() | Method | Returns whether the data is non-empty and has only whitespace characters. | bool | |
| encode(encoding="utf-8", errors="strict") | Method | Encodes the data. | bytes | |
| join(iterable) | Method | Concatenation. | str | |
| lower() | Method | Converts the data into lowercase letters. | str | |
| replace(old, new[, count]) | Method | Replaces data. | str | |
| strip([chars]) | Method | Removes the prefix and suffix consisting of the specified characters. | str | |
| upper() | Method | Converts the data into uppercase letters. | str | |
| bytes | count(sub[, start[, end]]) | Method | Counts substrings. | int |
| find(sub[, start[, end]]) | Method | Searches for matched substrings. | int | |
| index(sub[, start[, end]]) | Method | Indexes matched substrings. | int | |
| decode(encoding="utf-8", errors="strict") | Method | Decodes the data. | str | |
| replace(old, new[, count]) | Method | Replaces the data. | bytes | |
| rstrip([chars]) | Method | Removes the suffix consisting of the specified characters. | bytes | |
| strip([chars]) | Method | Removes the prefix and suffix consisting of the specified characters. | bytes | |
| split(sep=None, maxsplit=-1) | Method | Splits data. | list | |
| startswith(prefix[, start[, end]]) | Method | Compares the prefixes. | bool | |
| endswith(prefix[, start[, end]]) | Method | Compares the suffixes. | bool | |
| float | is_integer() | Method | Returns whether the data is an integer. | bool |
| list | count(x) | Method | Counts elements. | int |
| index(sub[, start[, end]]) | Method | Indexes elements. | int | |
| tuple | count(x) | Method | Counts elements. | int |
| index(sub[, start[, end]]) | Method | Indexes elements. | int | |
| dict | get(key[, default]) | Method | Gets the `key` value. | any |
| items | Method | Gets the key-value pair list. | list | |
| set | union(*others) | Method | Returns the new set, which is a union of the specified sets. | set |
| datetime.datetime | today() | Class method | Gets the current time without a time zone. | datetime.datetime |
| fromtimestamp(timestamp, tz=None) | Class method | Constructs the time based on a timestamp. | datetime.datetime | |
| now() | Class method | Gets the current time with a time zone. | datetime.datetime | |
| strptime(date_string, format) | Class method | Constructs the formatted time. | datetime.datetime | |
| time() | Method | Converts the data into a time point. | datetime.time | |
| date() | Method | Converts the data into a date. | datetime.date | |
| strftime(format) | Method | Formatting. | str | |
| datetime.date | today() | Class method | Gets the current date. | datetime.date |
| strftime(format) | Method | Formatting. | str | |
| datetime.time | strftime(format) | Method | Formatting. | str |
| DataSet | id() | Method | Gets the data set ID. | int |
| partitions() | Method | Gets the number of data set partitions. | int | |
| schema() | Method | Gets the data set schema. | Schema | |
| Record | data() | Method | Returns the elements as a list. | list |
| get(name, default=None) | Method | Gets the data of the specified field name. | any | |
| schema() | Method | Gets the data set schema. | Schema |
Built-in constants and functions
The expression mode supports constants None, True, and False. In addition, for ease of use, the expression mode has many built-in functions, which you can call to quickly implement the corresponding features and get the required data.
| Built-in Function | Description |
|---|---|
| abs(x) | Returns the absolute value of an integer or floating-point number. |
| all(iterable) | Returns whether all elements are True or None. |
| any(iterable) | Returns whether any elements are True. |
| ascii(object) | Prints the object without processing non-ASCII characters. |
| bool([x]) | Converts the data into a boolean value. |
| bytes([source[,encoding[,errors]]]) | Converts the data into a bytes object. |
| chr(i) | Returns the Unicode of an integer. |
| dict(kwarg)/dict(mapping,kwarg)/dict(iterable,kwarg) | Converts the data into a dict object. |
| float([x]) | Converts the data into a float. |
| int(x)/int(x,base) | Converts the data into an integer. |
| len(s) | Returns the length. |
| list([iterable]) | Converts the data into a list. |
| max(iterable,[,key,default])/max(arg1,arg2,args[,key]) | Returns the maximum value. |
| min(iterable,[,key,default])/min(arg1,arg2,args[,key]) | Returns the minimum value. |
| ord(c) | Returns the code of a char object. |
| pow(x,y[,z]) | Returns the value of x to the power of y, modulus z. |
| range(stop)/(start,stop[,step]) | Returns an immutable list. |
| repr(object) | Returns the information of the specified printable object. |
| round(number[,ndigits]) | Returns the number rounded to ndigits precision after the decimal point. |
| set([iterable]) | Converts the data into a set. |
| str(object)/(object,encoding,errors) | Converts the data into a string. |
| sum(iterable[,start]) | Calculates the sum. |
| tuple([iterable]) | Converts the data into a tuple. |
| type(object) | Returns the data type. |
Other third-party modules
The expression mode supports some common third-party Python modules.
| Module | Feature | Feature Type | Description | Feature Output |
|---|---|---|---|---|
| time | asctime([t]) | Function | Formats `struct_time`. | str |
| ctime([secs]) | Function | Formats a timestamp. | str | |
| gmtime([secs]) | Function | Generates the `struct_time` with a UTC time zone. | struct_time | |
| localtime([secs]) | Function | Generates the local `struct_time`. | struct_time | |
| mktime(t) | Function | Generates a timestamp for `struct_time`. | float | |
| strftime(format[,t]) | Function | Converts `struct_time` into a custom format. | str | |
| strptime(string[,format]) | Function | Converts `struct_time` into a string. | struct_time | |
| time() | Function | Generates the current timestamp. | float | |
| time_ns() | Function | Generates the current timestamp in nanoseconds. | int | |
| math | e | Constant | Value of Euler's number. | float |
| pi | Constant | Value of Pi. | float | |
| sqrt(x) | Function | Returns the square root. | float | |
| log([x,base]) | Function | Returns the logarithm. | float | |
| ceil(x) | Function | Returns the smallest integer greater than or equal to `x`. | int | |
| floor(x) | Function | Returns the greatest integer less than or equal to `x`. | int | |
| cos(x) | Function | Returns the cosine. | float | |
| fabs(x) | Function | Returns the absolute value. | float | |
| log2(x) | Function | Returns the base-2 logarithm of `x`. | float | |
| log10(x) | Function | Returns the base-10 logarithm of `x`. | float | |
| pow(x,y) | Function | Returns the value of `x` raised to the power `y`. | float | |
| sin(x) | Function | Returns the sine. | float | |
| tan(x) | Function | Returns the tangent. | float | |
| json | dumps(obj, *, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw) | Function | Encodes the data into JSON format. | str |
| loads(s, *, encoding=None, cls=None, object_hook=None, parse_float=None, parse_int=None, parse_constant=None, object_pairs_hook=None, **kw) | Function | Decodes the JSON data. | any | |
| base64 | b64encode(s, altchars=None) | Function | Encodes the data into Base64 format. | bytes |
| b64decode(s, altchars=None, validate=False) | Function | Decodes the Base64 data. | bytes | |
| random | randint(a, b) | Function | Returns a random integer in the range of [a,b]. | int |
| random() | Function | Returns a random floating-point number in the range of [0,1). | float | |
| urllib | parse.quote(string, safe='/', encoding=None, errors=None) | Function | Transcodes symbols. | str |
| parse.urlencode(query, doseq=False, safe='', encoding=None, errors=None) | Function | Encodes the URL. | float |
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