sizeof\_collection的功能是获取指定集合的元素数量。在design compiler等工具中,通过TCL语言操作时,会遇到list和collection这两种数组类型,其结构如图所示。get_cells方法返回的是多个元素,但这些元素是以collection的形式进行返回的。如果我们把这个collection赋值给一个变量,比如tmp,然后尝试打印这个变量,可能会得到乱...
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很多情况下需要对原有列表进行修改,这种修改通常包括:获取指定范围内的元素形成子列表;插入新的元素形成新列表;删除列表中的元素;替换列表中的元素;修改指定索引的列表元素等,对此,Tcl都提供了相应的命令。 lrange 功能:获取指定范围内的元素形成子列表 lrange需要三个参数:列表、第一个索引值和第二个索引值。索引值...
single_element.tcl set numbers {1 2 3 4 5 6 7 8 9} set middle [lrange $numbers 4 4] puts "The middle number is $middle" This extracts just the element at index 4 (the fifth element). The result is 5 as a single-element list. Note this differs from lindex which returns the ...
1.array get 命令 array get 命令提取数组索引、元素值对并将这些值对组织成一个列表。而 array set 命令则将一个列表(数据要成对)转换成一个数组。例 arraysetarr [list a AAA b BBB c CCC d DDD] array size arr ;#数组元素个数 结果=>4parray arr ...
array set arrayName list 设置数组arrayName的元素的值。 list 的 形式和array get的返回值的list形式一样。如果arrayName不存在,那么生成arrayName。例: % array set a {first 1 second 2} % puts $a(first) 1 % array get a second 2 first 1 array names arrayName ?pattern? 这个命令返回数组arr...
Here we get the second element of the second inner list of the inner list located at the 4th position of the main list. In other words: the inner most command is executed first. The[lindex $nums 3]returns{{1 2} {3 4}}. Now the second command operates on this returned list. The[...
elementos = lstProductos.get(0, tk.END) # Combprobar si nuevo elemento existe en listbox if item.get() in elementos: tk.messagebox.showinfo(message="El elemento ya existe en la lista", title="Error") else: lstProductos.insert(tk.END, item.get()) ...