在python列表的加减问题-基础python
问题中的ls1和ls2如何加减成为新的列表？直接加减的话不行
# 创建两个列表
lst1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
lst2 = [3, 5, 1, 7, 8, 2, 9, 4, 6, 0]
# 将元素两两相加并存储在lst1中
lst1 = [x + y for x, y in zip(lst1, lst2)]
# 将元素两两相减并存储在lst2中
lst2 = [x - y -y for x, y in zip(lst1, lst2)]
# 输出结果
print("lst1:", lst1)
print("lst2:", lst2)
- 你可以看下这个问题的回答https://ask.csdn.net/questions/7785226
- 这篇博客你也可以参考下：python计算两张图像的L1和L2损失
- 除此之外, 这篇博客: 使用python实现ls命令（1）中的 ls功能 部分也许能够解决你的问题, 你可以仔细阅读以下内容或者直接跳转源博客中阅读:
–20191107
要用python实现ls命令，那先要了解ls功能，尤其是各种参数。我打算先实现基本功能，然后在逐步添加参数功能。以下是我导出linux系统中ls命令的man手册。
LS(1) User Commands LS(1) NAME ls - list directory contents SYNOPSIS ls [OPTION]... [FILE]... DESCRIPTION List information about the FILEs (the current directory by default). Sort entries alphabetically if none of -cftuvSUX nor --sort is specified. Mandatory arguments to long options are mandatory for short options too. -a, --all do not ignore entries starting with . -A, --almost-all do not list implied . and .. --author with -l, print the author of each file -b, --escape print C-style escapes for nongraphic characters --block-size=SIZE scale sizes by SIZE before printing them; e.g., '--block-size=M' prints sizes in units of 1,048,576 bytes; see SIZE format below -B, --ignore-backups do not list implied entries ending with ~ -c with -lt: sort by, and show, ctime (time of last modification of file status information); with -l: show ctime and sort by name; otherwise: sort by ctime, newest first -C list entries by columns --color[=WHEN] colorize the output; WHEN can be 'never', 'auto', or 'always' (the default); more info below -d, --directory list directories themselves, not their contents -D, --dired generate output designed for Emacs' dired mode -f do not sort, enable -aU, disable -ls --color -F, --classify append indicator (one of */=>@|) to entries --file-type likewise, except do not append '*' --format=WORD across -x, commas -m, horizontal -x, long -l, single-column -1, verbose -l, vertical -C --full-time like -l --time-style=full-iso -g like -l, but do not list owner --group-directories-first group directories before files; can be augmented with a --sort option, but any use of --sort=none (-U) disables grouping -G, --no-group in a long listing, don't print group names -h, --human-readable with -l, print sizes in human readable format (e.g., 1K 234M 2G) --si likewise, but use powers of 1000 not 1024 -H, --dereference-command-line follow symbolic links listed on the command line --dereference-command-line-symlink-to-dir follow each command line symbolic link that points to a directory --hide=PATTERN do not list implied entries matching shell PATTERN (overridden by -a or -A) --indicator-style=WORD append indicator with style WORD to entry names: none (default), slash (-p), file-type (--file-type), classify (-F) -i, --inode print the index number of each file -I, --ignore=PATTERN do not list implied entries matching shell PATTERN -k, --kibibytes default to 1024-byte blocks for disk usage -l use a long listing format -L, --dereference when showing file information for a symbolic link, show information for the file the link references rather than for the link itself -m fill width with a comma separated list of entries -n, --numeric-uid-gid like -l, but list numeric user and group IDs -N, --literal print raw entry names (don't treat e.g. control characters specially) -o like -l, but do not list group information -p, --indicator-style=slash append / indicator to directories -q, --hide-control-chars print ? instead of nongraphic characters --show-control-chars show nongraphic characters as-is (the default, unless program is 'ls' and output is a terminal) -Q, --quote-name enclose entry names in double quotes --quoting-style=WORD use quoting style WORD for entry names: literal, locale, shell, shell-always, c, escape -r, --reverse reverse order while sorting -R, --recursive list subdirectories recursively -s, --size print the allocated size of each file, in blocks -S sort by file size --sort=WORD sort by WORD instead of name: none (-U), size (-S), time (-t), version (-v), extension (-X) --time=WORD with -l, show time as WORD instead of default modification time: atime or access or use (-u) ctime or status (-c); also use specified time as sort key if --sort=time --time-style=STYLE with -l, show times using style STYLE: full-iso, long-iso, iso, locale, or +FORMAT; FORMAT is interpreted like in 'date'; if FORMAT is FORMAT1<newline>FORMAT2, then FORMAT1 applies to non-recent files and FORMAT2 to recent files; if STYLE is prefixed with 'posix-', STYLE takes effect only outside the POSIX locale -t sort by modification time, newest first -T, --tabsize=COLS assume tab stops at each COLS instead of 8 -u with -lt: sort by, and show, access time; with -l: show access time and sort by name; otherwise: sort by access time -U do not sort; list entries in directory order -v natural sort of (version) numbers within text -w, --width=COLS assume screen width instead of current value -x list entries by lines instead of by columns -X sort alphabetically by entry extension -1 list one file per line SELinux options: --lcontext Display security context. Enable -l. Lines will probably be too wide for most displays. -Z, --context Display security context so it fits on most displays. Displays only mode, user, group, security context and file name. --scontext Display only security context and file name. --help display this help and exit --version output version information and exit SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000). Using color to distinguish file types is disabled both by default and with --color=never. With --color=auto, ls emits color codes only when standard output is connected to a terminal. The LS_COLORS environment variable can change the set‐ tings. Use the dircolors command to set it. Exit status: 0 if OK, 1 if minor problems (e.g., cannot access subdirectory), 2 if serious trouble (e.g., cannot access command-line argument). GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report ls translation bugs to <http://translationpro‐ ject.org/team/> AUTHOR Written by Richard M. Stallman and David MacKenzie. COPYRIGHT Copyright © 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO The full documentation for ls is maintained as a Texinfo manual. If the info and ls programs are properly installed at your site, the command info coreutils 'ls invocation' should give you access to the complete manual. GNU coreutils 8.22 November 2016 LS(1) - 以下回答来自chatgpt:
如果要对两个列表ls1和ls2进行加法运算，可以使用extend()方法进行拼接。具体步骤如下：
- 创建两个要进行加法运算的列表ls1和ls2。
ls1 = [1, 2, 3] ls2 = [4, 5, 6]- 使用extend()方法将ls2拼接到ls1的末尾，得到一个新的列表ls3。
ls3 = ls1.extend(ls2)- 输出ls3，查看运算结果。
print(ls3)运行结果应该是[1, 2, 3, 4, 5, 6]。
如果要进行减法运算，则可以使用remove()方法将ls2中的元素从ls1中移除，具体步骤如下：
- 创建两个要进行减法运算的列表ls1和ls2。
ls1 = [1, 2, 3, 4, 5] ls2 = [3, 4]- 使用循环和remove()方法将ls2中的元素从ls1中一个个移除。
for i in ls2: ls1.remove(i)- 输出ls1，查看运算结果。
print(ls1)运行结果应该是[1, 2, 5]。
需要注意的是，使用remove()方法时需要确保ls2中的元素都在ls1中存在。否则会报错ValueError: list.remove(x): x not in list。
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