Common python functions

1. mathematical correlation 1. absolute value: abs (-1) 2. maximum and minimum values: max ([, 3]) and min ([, 3]) 3. sequence length: len (abc), len ([, 3]), len (, 3) 4. modulo: divmod) 5...

1. mathematical correlation 1. absolute value: abs (-1) 2. maximum and minimum values: max ([, 3]) and min ([, 3]) 3. sequence length: len ('ABC'), len ([, 3]), len (, 3) 4. modulo: pmod) 5. multiplication: pow (3/46, 4) // 2 ** 1.0, floating point: round (1) // 2. function related 1. Can the function be called: callable (funcname). Note that the funcname variable must be defined. 2. type judgment: isinstance (x, list/int). 3. Comparison: cmp ('hello', 'Hello ') 4. fast generation sequence: (x) range ([start,] stop [, step]) 3. type conversion 1, int (x) 2, long (x) 3. float (x) 4, complex (x) // plural number 5, str (x) 6, list (x) 7, tuple (x) // tuples 8, hex (x) 9, oct (x) 10, chr (x) // returns the characters corresponding to x, such as chr (65) return 'A' 11, ord (x) // return the number of the ASC code corresponding to the character. for example, ord ('A') returns 65. string processing 1. uppercase letters: str. capitalize2, string replacement: str. replace3, string cutting: str. split 5. sequence processing functions 1. len: sequence length 2. max: maximum value in the sequence 3. min: minimum value 4. filter: filter sequence 6. parallel zip map reduce

Time type processing:

Time. time () returns the current timestamp, namely, 1394647431.90625 seconds. asctime () returns the ascii table format at that time, 'thu Mar 13 02:03:46 123' time. the string format of ctime () current time is 'thu Mar 13 02:04:59 123456' and the ascii code table is displayed in the same format as time. ctime (); time. ctime (time. time () you can specify a timestamp to convert it to the string format 'wed Mar 12 08:26:26 123' time. localtime () returns the internal time format struct_time format time of the current time zone. struct_time (maid = 2014, tm_mon = 3, tm_mday = 13, tm_hour = 2, tm_min = 8, tm_sec = 14, tm_wday = 3, tm_yday = 72, tm_is Dst = 0) time. localtime () [: 6] # (2014, 3, 13, 8, 15, 7, 3, 72) time. localtime () [0: 9] # (2014, 3, 13, 8, 15, 24, 3, 72, 0) time. gmtime () converts the timestamp into the struct_time structure of the UTC time zone (0 time zone), time. mktime () converts an internal time format to a timestamp, that is, 1394583457.0 time in seconds. mktime (time. localtime (time. time (), such as 1394583457.0time.strftime ("% Y-% m-% d", time. localtime (time. time () can be used to convert the internal time structure into the specified string format '2017-3-12 'time. strftime ("% Y-% m-% d % H: % M: % S", time. lo Caltime () such as '2017-03-13 01:54:27 'time. strftime ("% a % B % d % H: % M: % S % Y", time. localtime (), such as 'thu Mar 13 01:55:05 123' time. strptime () converts the string format time to the internal time format time. strptime ("Sat Mar 28 22:24:25 2009", "% a % B % d % H: % M: % S % Y") returns a struct_time structure time. struct_time (maid = 2009, tm_mon = 3, tm_mday = 28, tm_hour = 22, tm_min = 24, tm_sec = 25, tm_wday = 5, tm_yday = 87, tm_isdst =-1) a = "Sat Mar 28 22:24:24 2009" this is to turn the character into stru After the ct_time internal structure, use time. mktime () to generate a timestamp, that is, to generate a string. B = time. mktime (time. strptime (a, "% a % B % d % H: % M: % S % Y "))