file read and write

steven.chen3 · steven.chen3 · commit dca150880f2d · 2022-10-23T02:38:22.000-07:00
diff --git a/helloworld/check_file_39.py b/helloworld/check_file_39.py
@@ -0,0 +1,16 @@
+import os
+import os.path as ospath
+from pathlib import Path
+
+print(ospath.exists("newfile2.txt"))
+print(ospath.isfile("newfile.txt"))
+print(ospath.isdir("newfile.txt"))
+
+print("===============")
+path = Path("sample.txt")
+print(path.exists())
+print(path.is_file())
+print(path.is_dir())
+
+# os.rename("newfile.txt", "newfile2.txt")
+os.remove("newfile2.txt")
diff --git a/helloworld/create_file_39.py b/helloworld/create_file_39.py
@@ -0,0 +1,3 @@
+file_instance = open("newfile.txt", 'x')  # 'w'
+file_instance.write("asdfasfdasdf\n")
+file_instance.close()
diff --git a/helloworld/main.py b/helloworld/main.py
@@ -1,13 +0,0 @@
-import sys
-
-
-def main():
-    args = sys.argv[1:]
-
-    for arg in args:
-        print(arg)
-
-
-if __name__ == '__main__':
-    main()
-
diff --git a/helloworld/read_file_39.py b/helloworld/read_file_39.py
@@ -0,0 +1,10 @@
+file_instance = open("sample.txt", 'r')
+
+while True:
+    line = file_instance.readline()
+    if line == '':
+        break
+
+    print(line)
+
+file_instance.close()
diff --git a/helloworld/sample.txt b/helloworld/sample.txt
@@ -0,0 +1,4 @@
+This is new string
+aaaaa
+bbbbbb
+cccccc
diff --git a/helloworld/write_file_39.py b/helloworld/write_file_39.py
@@ -0,0 +1,7 @@
+file_instance = open("sample.txt", 'w')  # 'w' - overwrite
+
+file_instance.write("This is new string\n")
+
+file_instance.writelines(["aaaaa\n", "bbbbbb\n", "cccccc\n"])
+
+file_instance.close()

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+file_instance = open("newfile.txt", 'x') # 'w'`
	`2`	`+file_instance.write("asdfasfdasdf\n")`
	`3`	`+file_instance.close()`
-Original file line number
+Diff line change
@@ @@ -0,0 +1,4 @@ @@
 +This is new string
 +aaaaa
 +bbbbbb
 +cccccc