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                [TOC] # 文件寫入 ipython ~~~ In [1]: %%writefile tang.txt ...: x,y,z,w,a,b ...: 1,2,3,4,5,6 ...: 2,3,5,6,4,1 ...: Writing tang.txt ~~~ # 文件讀取 ~~~ data = np.loadtxt('tang2.txt', delimiter = ',', skiprows = 1) data ~~~ 'tang2.txt': 路徑最好和文件放一起 skiprows: 去掉幾行 delimiter=',' 分隔符 usecols=(0,1,4)指定使用那幾列 # 數組保存 ~~~ import numpy as np tang_array = np.array([[1, 2, 3], [4, 5, 6]]) # 這樣保存后面會顯示很多小數點 np.savetxt('tang.txt', tang_array) # fmt指定格式是數字類型,delimiter指定分割符是, 這些參數是可寫可不寫的,不寫分割符默認是空格 savetxt = np.savetxt('tang2.txt', tang_array, fmt='%d', delimiter=',') print(savetxt) ~~~ # 讀寫array結構 ~~~ import numpy as np tang_array = np.array([[1, 2, 3], [4, 5, 6]]) # 一般保存為npy np.save('tang_array.npy', tang_array) tang = np.load('tang_array.npy') print(tang) ~~~ 輸出 ~~~ [[1 2 3] [4 5 6]] ~~~ **保存為壓縮文件** ~~~ import numpy as np tang_array = np.arange(10) # 壓縮文件用savez,他會保存為一個壓縮文件夾,里面有2個文件 np.savez('tang_array.npz', a=tang_array, b=tang_array) tang = np.load('tang_array.npz') # 查看有哪些文件 print(tang.keys()) # 查看文件的內容,a,b是之前保存的文件名,用這個作為key print(tang['a']) print(tang['b']) ~~~ 輸出 ~~~ ['a', 'b'] [0 1 2 3 4 5 6 7 8 9] [0 1 2 3 4 5 6 7 8 9] ~~~
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