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This article mainly explains "what is the python time library". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what is the python time library.

Catalogue

The role of the 1.Time Library

2. The use of Time library

Time acquisition function

Time formatting: show time in a reasonable way

Construct a time in the form of a string

Program timing application: the process of measuring the time experienced by a start-stop action

3. Example: text progress bar

Example 1: each progress line break:

Example 2: each progress does not change the line, but constantly refreshes: overwrite the previous character with the printed character

Extension: different design functions of the text progress bar:

The role of the 1.Time Library

Time library is the standard library of processing time in Python.

Provides the function of getting system time and formatting output

Provide system-level accurate timing function for program performance analysis

2. The use of Time library

Let's clarify a few concepts:

Time stamp: the total number of seconds since 00: 00: 00 GMT, January 1, 1970 (08:00:00, Beijing time, January 1, 1970) is a number.

A common way to get time in Python is to get the timestamp first, and then convert it to the desired time format.

Tuple struct_time: date and time contain many variables, so a tuple struct_time is defined in Python to combine all these variables, including year, month, day, hour, minute, second, and so on.

Time acquisition function

Time formatting: show time in a reasonable way

Construct a time in the form of a string

Question: can we construct a time in the form of a string, such as "2018-01-26 12:55:20" and turn it into a time variable?

The answer is yes, by showing that the parameters defined by the template parse each corresponding value in the string one by one, it may form a time variable. Into a time that can be operated inside a computer.

Program timing application: the process of measuring the time experienced by a start-stop action

Question: the perf_counter () function is used for program timing, but isn't the time () function OK?

Answer:

Time () is relatively less precise, and affected by the system, it is suitable to represent the date and time or the timing of large programs.

Perf_counter () is suitable for smaller program tests and calculates the sleep () time.

3. Example: text progress bar example 1: each progress line wrap:

The print () function outputs one character by default and wraps it to the next line, so there is no need to do anything else.

Output result > >

Example 2: each progress does not change the line, but constantly refreshes: overwrite the previous character with the printed character

In order to achieve a single-line dynamic refresh, we need to require our program not to wrap to the next line when outputting a string of one character. Because after switching to the next line, the previous information cannot be modified.

Escape character\ r (move the cursor to the beginning of the line)

The use of escape characters bothered me for a long time, such as where to put it, so I put it in a separate document to introduce ~ ~

Output result > >

Extension: different design functions of the text progress bar:

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