Truncate the file to at most sizebytes.(文件截取) In [113]: f1.truncate(f1.tell()) #(指针所在处之后的内容全部删掉) In [115]: f1.closed #(closed是属性,判断文件是否为关闭状态) Out[115]: False In [116]: f1.encoding #(获取当前文件编码) In [117]:
string.count('x'): 这将返回字符串中'x'的出现次数 string.find('x'): 这将返回字符串中字符'x'的位置 string.lower(): 这将把字符串转换为小写 string.upper(): 这将把字符串转换为大写 string.replace('a', 'b'): 这将用b替换字符串中的所有a 此外,我们可以使用len()方法获取字符串中字符的数...
2.Some software event occurred outside the process’s control but effects the process. For instance, input became available on a file descriptor, the terminal window got resized, process’s CPU time limit exceeded, etc. 3.User typed some terminal special characters like interrupt(Ctrl+C) or s...
f.truncate:截取最大指定字节 注意: 文件方法read()等在读取文件时,会一并读取其行结束符 文件方法write()执行写出操作时,不会自动为其添加行结束符 6、文件对象属性 with语法 2.5开始支持with语法 用于需要打开、关闭成对的操作 可以自动关闭打开的对象 语法: with open_expr as obj: expression 代码语...
concatenate ordinary characters, so last matches the string 'last'. The special characters are: "." Matches any character except a newline. "^" Matches the start of the string. "$" Matches the end of the string or just before the newline at ...
characters in S are whitespace 165 and there is at least one character in S, False otherwise. 166 """ 167 return False 168 169 def istitle(self): 170 """ 171 S.istitle() -> bool 172 173 Return True if S is a titlecased string and there is at least one 174 character in S, i...
| Convert a number or string to an integer, or return 0 if no arguments | are given. If x is a number, return x.__int__(). For floating point | numbers, this truncates towards zero. | | If x is not a number or if base is given, then x must be a string, ...
truncate to_csv bool at clip radd to_markdown value_counts first isna between_time replace sample idxmin div iloc add_suffix pipe to_sql items max rsub flags sem to_string to_excel prod fillna backfill align pct_change expanding nsmallest append attrs rmod bfill ndim rank floordiv unstack...
dirp) return NULL; /* Convert directory name to wide-character string */ wchar_t wname[PATH_MAX + 1]; size_t n; int error = mbstowcs_s(&n, wname, PATH_MAX + 1, dirname, PATH_MAX + 1); if (error) goto exit_failure; /* Open directory stream using wide-character name */ ...
HAVE_TRUNCATE = "1" HAVE_TZNAME = "0" HAVE_UCS4_TCL = "0" HAVE_UNAME = "1" HAVE_UNISTD_H = "1" HAVE_UNLINKAT = "1" HAVE_USABLE_WCHAR_T = "0" HAVE_UTIL_H = "1" HAVE_UTIMENSAT = "1" HAVE_UTIMES = "1" HAVE_UTIME_H = "1" HAVE_UUID_CREATE = "0" HAVE_UUID_ENC...