Question

首先，我导入一个名为file_1，...，file_25的文件至25个文件；如果我导入七个，则可以是file_1到file_7，也可以是其他任何文件。

接下来，我将它们合并为一个。我是通过

files = ["file_1","file_2","file_3","file_4","file_5","file_6","file_7","file_8","file_9","file_10","file_11","file_12","file_13","file_14","file_15","file_16","file_17","file_18","file_19","file_20","file_21","file_22","file_23","file_24","file_25"]
all_files = pd.DataFrame()
for file in files:
    if file in globals():
        print("Merging", file)
        all_files = all_files.append(eval(file))
    else:
        print(file, "not in globals")

（供以后的读者注意：列表files可以通过Excel轻松创建；无需全部输入）

为避免内存错误，我然后要删除所有现有文件。我在想类似的东西

a = 1
b = 2
c = 3

l = [a,b,c]

for l in l:
    del l

但它不起作用（我知道还没有条件检查其中是否存在，但是如果列表中的所有文件都存在，它也将不起作用。该如何解决？

编辑：完整示例：

file_1 = pd.read_csv("path/file_1")
file_2 = pd.read_csv("path/file_2")
file_3 = pd.read_csv("path/file_3")
file_4 = pd.read_csv("path/file_4")
file_5 = pd.read_csv("path/file_5")
file_6 = pd.read_csv("path/file_6")
file_7 = pd.read_csv("path/file_7")
file_8 = pd.read_csv("path/file_8")
file_9 = pd.read_csv("path/file_9")
file_10 = pd.read_csv("path/file_10")
file_11 = pd.read_csv("path/file_11")
file_12 = pd.read_csv("path/file_12")
file_13 = pd.read_csv("path/file_13")
file_14 = pd.read_csv("path/file_14")
file_15 = pd.read_csv("path/file_15")
file_16 = pd.read_csv("path/file_16")
file_17 = pd.read_csv("path/file_17")
file_18 = pd.read_csv("path/file_18")
file_19 = pd.read_csv("path/file_19")
file_20 = pd.read_csv("path/file_20")
file_21 = pd.read_csv("path/file_21")
file_22 = pd.read_csv("path/file_22")
file_23 = pd.read_csv("path/file_23")
file_24 = pd.read_csv("path/file_24")
file_25 = pd.read_csv("path/file_25")

files = ["file_1","file_2","file_3","file_4","file_5","file_6","file_7","file_8","file_9","file_10","file_11","file_12","file_13","file_14","file_15","file_16","file_17","file_18","file_19","file_20","file_21","file_22","file_23","file_24","file_25"]
all_files = pd.DataFrame()
for file in files:
    if file in globals():
        print("Merging", file)
        all_files = all_files.append(eval(file))
    else:
        print(file, "not in globals")

# How to simplfy the following?
del file_1
del file_2
del file_3
del file_4
del file_5
del file_6
del file_7
del file_8
del file_9
del file_10
del file_11
del file_12
del file_13
del file_14
del file_15
del file_16
del file_17
del file_18
del file_19
del file_20
del file_21
del file_22
del file_23
del file_24
del file_25

我希望能够导入文件的子集，但仍然具有自动执行的以下步骤（将它们放入一个变量并删除单个文件）。我成功完成了第一步（将它们放入一个变量），但是没有完成第二步（删除单个文件）。我想以某种方式循环遍历变量并检查它们是否存在；如果有，请删除它们。该怎么做？

Python：删除多个变量（如果存在）

0 个答案: