#15
#從模組匯入檔名
from sys import ar**
script,filename = ar**
#先開啟再讀取
txt = open(filename)
print(f"heres your file :")
print(txt.read())
print(txt.read())
#另一種方式匯入，手動輸入檔名
print("type your filename again:")
file_again = input('>來')
txt_again = open(file_again)
print(txt_again.read())
print("hello world")
#text_again.seek(0)
#print(txt_again.read())
#無法用read連續兩次讀取同一資料夾，一種說法是游標會移動到末尾，用seek重新定位解決而在我這裡行不通，看到另一種說法說read完檔案會直接關閉。
#16
from sys import ar**
script,filename = ar**
print(f"we're going to erase .")
print("if you don't want that, hit ctrl-c(^c).")
print("if you do want that ,hit return.")
input("?")
print("opening the file ")
target = open(filename,'w')
print("truncating the file.goodbye!")
target.truncate()
print("now i'm going to ask you for three lines")
line1=input("line 1:")
line2=input("line 2:")
line3=input("line 3:")
print("i'm going to write these to the file")
target.write(f"""
""")
print("and finally ,we close it")
target.close()
file_again = input('>來讀一讀')
txt_again = open(file_again)
print(txt_again.read())
#17
from sys import ar**
from os.path import exists
script,from_file, to_file= ar**
print(f"copying from to ")
#we could do these two on one line,how?
indata=open(from_file).read()
print(f"the input file is bytes long")
print(f"does the output file exists?")
input("ready, hit return to continue,ctrl_c to abort")
out_file = open(to_file,'w')
out_file.write(indata)
print("finish")
out_file.close()
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